ci(deps): bump anomalyco/opencode/github (#639)

Bumps the github-actions group with 1 update: [anomalyco/opencode/github](https://github.com/anomalyco/opencode).


Updates `anomalyco/opencode/github` from 2.0.20 to 2.0.21
- [Release notes](https://github.com/anomalyco/opencode/releases)
- [Commits](https://github.com/anomalyco/opencode/compare/84c9be93a56304a108f1a22df0c5d62c26d5b6ca...8a8bd622a3d7dc29ccf30ec17f84e363ed95ed72)

---
updated-dependencies:
- dependency-name: anomalyco/opencode/github
  dependency-version: 2.0.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: github-actions
...

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

.github/workflows/issue-validation.yml

@@ -662,7 +662,7 @@ jobs:
         uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 #v7.0.1
 
       - name: Run opencode
-        uses: anomalyco/opencode/github@84c9be93a56304a108f1a22df0c5d62c26d5b6ca #v2.0.20
+        uses: anomalyco/opencode/github@8a8bd622a3d7dc29ccf30ec17f84e363ed95ed72 #v2.0.21
         env:
           ZHIPU_API_KEY: ${{ secrets.ZHIPU_API_KEY }}
           TOKEN: ${{ secrets.GITHUB_TOKEN }}