Bump actions/setup-go from 5 to 6 (#3200)

* 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>

* Update go GHA config to Go 1.25

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Cole Greer <112986082+Cole-Greer@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/build-test.yml

@@ -398,7 +398,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v6
       - name: Setup Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: '1.25'
       - name: Get Cached Server Base Image