Update Gazelle to 0.51.3

Add loongarch64 support (#4610)

What type of PR is this?

Bug fix

What does this PR do? Why is it needed?

It matches GOARCH loong64 to something so that rules_go would work on
LoongArch.

Which issues(s) does this PR fix?

#4609

Revert "Issue 1486: cgo: fix C++ dynamic initialization of static var…

…iables when using alwayslink = True (#4438)" (#4551)

This reverts commit 20f7e2b as it
causes a regression (see #4548)

Add missing load statements (#4508)

This is required for compatibility with bazel @ HEAD. Done with:
`buildifier --lint=fix -r .`

Update Bazel to 7.7.0 (#4492)

**What type of PR is this?**

Dep update

**What does this PR do? Why is it needed?**

**Which issues(s) does this PR fix?**

Fixes #

**Other notes for review**

.bazelci/presubmit.yml: run BCR tests with multiple Bazel versions (#…

…4490)

**What type of PR is this?**

> Test

**What does this PR do? Why is it needed?**

On presubmit, run the BCR test with multiple Bazel versions. This helps
us
catch issues before a release.

**Which issues(s) does this PR fix?**

n/a

**Other notes for review**

Fix pure mode detection (#4470)

**What type of PR is this?**

Bug fix

**What does this PR do? Why is it needed?**

* `go_proto_library`, `nogo`, and `stdlib` may use cgo and thus need the
relevant attributes to detect the availability of a C++ toolchain.
* All rules should continue to use a pure build if the `pure` flag is
turned off or the toolchain turns off cgo via a constraint.

**Which issues(s) does this PR fix?**

Fixes #4447

**Other notes for review**

Fix pure mode detection (#4470)

**What type of PR is this?**

Bug fix

**What does this PR do? Why is it needed?**

* `go_proto_library`, `nogo`, and `stdlib` may use cgo and thus need the
relevant attributes to detect the availability of a C++ toolchain.
* All rules should continue to use a pure build if the `pure` flag is
turned off or the toolchain turns off cgo via a constraint.

**Which issues(s) does this PR fix?**

Fixes #4447

**Other notes for review**

Find runfiles when a binary is executed from PATH (#4426)

**What type of PR is this?**

Feature

**What does this PR do? Why is it needed?**

**Which issues(s) does this PR fix?**

**Other notes for review**


https://bazelbuild.slack.com/archives/CDBP88Z0D/p1751654245992999?thread_ts=1751654245.992999&cid=CDBP88Z0D

Drop compatibility with 6.0.0 (#4411)

**What type of PR is this?**

Cleanup

**What does this PR do? Why is it needed?**

Simplify C++ toolchain handling by requiring at least Bazel 6.1.0. This
will be used in future PRs to implement proper, exec-platform aware
resolution for the combination of Go and (optional) C++ toolchain.

**Which issues(s) does this PR fix?**

**Other notes for review**