ci(deps): bump anomalyco/opencode in the github-actions group (#229)

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


Updates `anomalyco/opencode` from 1.2.15 to 1.2.20
- [Release notes](https://github.com/anomalyco/opencode/releases)
- [Commits](https://github.com/anomalyco/opencode/compare/799b2623cbb1c0f19e045d87c2c8593e83678bc0...6c7d968c4423a0cd6c85099c9377a6066313fa0a)

---
updated-dependencies:
- dependency-name: anomalyco/opencode
  dependency-version: 1.2.20
  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

@@ -144,7 +144,7 @@ jobs:
           fi
 
       - name: Run opencode analysis
-        uses: anomalyco/opencode/github@799b2623cbb1c0f19e045d87c2c8593e83678bc0 #v1.2.15
+        uses: anomalyco/opencode/github@6c7d968c4423a0cd6c85099c9377a6066313fa0a #v1.2.20
         env:
           ZHIPU_API_KEY: ${{ secrets.ZHIPU_API_KEY }}
         with:
@@ -273,7 +273,7 @@ jobs:
           gh pr comment ${{ github.event.pull_request.number }} --body-file comment.md
 
       - name: Run opencode analysis
-        uses: anomalyco/opencode/github@799b2623cbb1c0f19e045d87c2c8593e83678bc0 #v1.2.15
+        uses: anomalyco/opencode/github@6c7d968c4423a0cd6c85099c9377a6066313fa0a #v1.2.20
         env:
           ZHIPU_API_KEY: ${{ secrets.ZHIPU_API_KEY }}
         with:
@@ -295,7 +295,7 @@ jobs:
         uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 #v6.0.1
 
       - name: Run opencode
-        uses: anomalyco/opencode/github@799b2623cbb1c0f19e045d87c2c8593e83678bc0 #v1.2.15
+        uses: anomalyco/opencode/github@6c7d968c4423a0cd6c85099c9377a6066313fa0a #v1.2.20
         env:
           ZHIPU_API_KEY: ${{ secrets.ZHIPU_API_KEY }}
         with: