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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [linkinator](https://togithub.com/JustinBeckwith/linkinator) | [`^2.0.0` -> `^4.0.0`](https://renovatebot.com/diffs/npm/linkinator/2.16.2/4.0.0) | [![age](https://badges.renovateapi.com/packages/npm/linkinator/4.0.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/npm/linkinator/4.0.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/npm/linkinator/4.0.0/compatibility-slim/2.16.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/npm/linkinator/4.0.0/confidence-slim/2.16.2)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>JustinBeckwith/linkinator</summary>

### [`v4.0.0`](https://togithub.com/JustinBeckwith/linkinator/releases/tag/v4.0.0)

[Compare Source](https://togithub.com/JustinBeckwith/linkinator/compare/v3.1.0...v4.0.0)

##### Features

-   create new release with notes ([#&#8203;508](https://togithub.com/JustinBeckwith/linkinator/issues/508)) ([2cab633](https://togithub.com/JustinBeckwith/linkinator/commit/2cab633c9659eb10794a4bac06f8b0acdc3e2c0c))

##### BREAKING CHANGES

-   The commits in [#&#8203;507](https://togithub.com/JustinBeckwith/linkinator/issues/507) and [#&#8203;506](https://togithub.com/JustinBeckwith/linkinator/issues/506) both had breaking changes.  They included dropping support for Node.js 12.x and updating the CSV export to be streaming, and to use a new way of writing the CSV file.  This is an empty to commit using the `BREAKING CHANGE` format in the commit message to ensure a release is triggered.

### [`v3.1.0`](https://togithub.com/JustinBeckwith/linkinator/releases/tag/v3.1.0)

[Compare Source](https://togithub.com/JustinBeckwith/linkinator/compare/v3.0.6...v3.1.0)

##### Features

-   allow --skip to be defined multiple times ([#&#8203;399](https://togithub.com/JustinBeckwith/linkinator/issues/399)) ([5ca5a46](https://togithub.com/JustinBeckwith/linkinator/commit/5ca5a461508e688de12e5ae6b4cfb6565f832ebf))

### [`v3.0.6`](https://togithub.com/JustinBeckwith/linkinator/releases/tag/v3.0.6)

[Compare Source](https://togithub.com/JustinBeckwith/linkinator/compare/v3.0.5...v3.0.6)

##### Bug Fixes

-   **deps:** upgrade node-glob to v8 ([#&#8203;397](https://togithub.com/JustinBeckwith/linkinator/issues/397)) ([d334dc6](https://togithub.com/JustinBeckwith/linkinator/commit/d334dc6734cd7c2b73d7ed3dea0550a6c3072ad5))

### [`v3.0.5`](https://togithub.com/JustinBeckwith/linkinator/releases/tag/v3.0.5)

[Compare Source](https://togithub.com/JustinBeckwith/linkinator/compare/v3.0.4...v3.0.5)

##### Bug Fixes

-   **deps:** upgrade to htmlparser2 v8.0.1 ([#&#8203;396](https://togithub.com/JustinBeckwith/linkinator/issues/396)) ([ba3b9a8](https://togithub.com/JustinBeckwith/linkinator/commit/ba3b9a8a9b19d39af6ed91790135e833b80c1eb6))

### [`v3.0.4`](https://togithub.com/JustinBeckwith/linkinator/releases/tag/v3.0.4)

[Compare Source](https://togithub.com/JustinBeckwith/linkinator/compare/v3.0.3...v3.0.4)

##### Bug Fixes

-   **deps:** update dependency gaxios to v5 ([#&#8203;391](https://togithub.com/JustinBeckwith/linkinator/issues/391)) ([48af50e](https://togithub.com/JustinBeckwith/linkinator/commit/48af50e787731204aeb7eff41325c62291311e45))

### [`v3.0.3`](https://togithub.com/JustinBeckwith/linkinator/releases/tag/v3.0.3)

[Compare Source](https://togithub.com/JustinBeckwith/linkinator/compare/v3.0.2...v3.0.3)

##### Bug Fixes

-   export getConfig from index ([#&#8203;371](https://togithub.com/JustinBeckwith/linkinator/issues/371)) ([0bc0355](https://togithub.com/JustinBeckwith/linkinator/commit/0bc0355c7e2ea457f247e6b52d1577b8c4ecb3a1))

### [`v3.0.2`](https://togithub.com/JustinBeckwith/linkinator/releases/tag/v3.0.2)

[Compare Source](https://togithub.com/JustinBeckwith/linkinator/compare/v3.0.1...v3.0.2)

##### Bug Fixes

-   allow server root with trailing slash ([#&#8203;370](https://togithub.com/JustinBeckwith/linkinator/issues/370)) ([8adf6b0](https://togithub.com/JustinBeckwith/linkinator/commit/8adf6b025fda250e38461f1cdad40fe08c3b3b7c))

### [`v3.0.1`](https://togithub.com/JustinBeckwith/linkinator/releases/tag/v3.0.1)

[Compare Source](https://togithub.com/JustinBeckwith/linkinator/compare/v3.0.0...v3.0.1)

##### Bug Fixes

-   decode path parts in local web server ([#&#8203;369](https://togithub.com/JustinBeckwith/linkinator/issues/369)) ([4696a0c](https://togithub.com/JustinBeckwith/linkinator/commit/4696a0c38c341b178ed815f47371fca955979feb))

### [`v3.0.0`](https://togithub.com/JustinBeckwith/linkinator/releases/tag/v3.0.0)

[Compare Source](https://togithub.com/JustinBeckwith/linkinator/compare/v2.16.2...v3.0.0)

##### Bug Fixes

-   **deps:** update dependency chalk to v5 ([#&#8203;362](https://togithub.com/JustinBeckwith/linkinator/issues/362)) ([4b17a8d](https://togithub.com/JustinBeckwith/linkinator/commit/4b17a8d87b649eaf813428f8ee6955e1d21dae4f))

-   feat!: convert to es modules, drop node 10 ([#&#8203;359](https://togithub.com/JustinBeckwith/linkinator/issues/359)) ([efee299](https://togithub.com/JustinBeckwith/linkinator/commit/efee299ab8a805accef751eecf8538915a4e7783)), closes [#&#8203;359](https://togithub.com/JustinBeckwith/linkinator/issues/359)

##### BREAKING CHANGES

-   this module now requires node.js 12 and above, and has moved to es modules by default.

</details>

---

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because the tools are already installed in the docker image as of googleapis/testing-infra-docker#227
Source-Link: googleapis/synthtool@ab7384e
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-nodejs:latest@sha256:bb493bf01d28519e82ab61c490c20122c85a7119c03a978ad0c34b4239fbad15

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