.github: Bump actions/setup-go from 6.2.0 to 6.3.0

Bumps [actions/setup-go](https://github.com/actions/setup-go) from 6.2.0 to 6.3.0.
- [Release notes](https://github.com/actions/setup-go/releases)
- [Commits](https://github.com/actions/setup-go/compare/7a3fe6cf4cb3a834922a1244abfce67bcef6a0c5...4b73464bb391d4059bd26b0524d20df3927bd417)

---
updated-dependencies:
- dependency-name: actions/setup-go
  dependency-version: 6.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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