Update NuGet API endpoint. (google#300)

The "registration3" endpoint returns outdated data. Use
"registration5-semver1" instead.

Fix OSV package (google#299)

* Upgrade osv library version for PyPI bridge.

* Add missing __init__.py

Bump follow-redirects from 1.14.7 to 1.14.8 in /gcp/appengine/fronten…

…d3 (google#297)

Bumps [follow-redirects](https://github.com/follow-redirects/follow-redirects) from 1.14.7 to 1.14.8.
- [Release notes](https://github.com/follow-redirects/follow-redirects/releases)
- [Commits](follow-redirects/follow-redirects@v1.14.7...v1.14.8)

---
updated-dependencies:
- dependency-name: follow-redirects
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Update setup.py

Fix incorrect Semver ecosystem next_version. (google#271)

Add next_version to ecosystem helpers. (google#270)

This is useful for converting ranges from other formats.

Fix incorrect OSS-Fuzz source_id setting. (google#263)

Update setup.py (google#256)

Add GitHub action for publishing PyPI package. (google#219)