Bump actions/setup-go from 5 to 6

Bumps [actions/setup-go](https://github.com/actions/setup-go) from 5 to 6.
- [Release notes](https://github.com/actions/setup-go/releases)
- [Commits](actions/setup-go@v5...v6)

---
updated-dependencies:
- dependency-name: actions/setup-go
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -108,7 +108,7 @@ jobs:
       # We need the Go version and Go cache location for the actions/cache step,
       # so the Go installation must happen before that.
       - id: setup-go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           # There is no expectation for actual Go code so we disable caching as
           # it relies on the existence of a go.sum file.