chore(deps): bump docker/cagent-action in the github-actions group (#776)

Bumps the github-actions group with 1 update: [docker/cagent-action](https://github.com/docker/cagent-action).


Updates `docker/cagent-action` from 1.2.11 to 1.2.13
- [Release notes](https://github.com/docker/cagent-action/releases)
- [Commits](docker/cagent-action@b6e1c73...3a12dbd)

---
updated-dependencies:
- dependency-name: docker/cagent-action
  dependency-version: 1.2.13
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: github-actions
...

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Author: dependabot[bot]

.github/workflows/release.yml

@@ -167,7 +167,7 @@ jobs:
           fetch-depth: 0
 
       - name: Generate release notes
-        uses: docker/cagent-action@b6e1c73e1bb475e840842b1f43a4647fcb16b495
+        uses: docker/cagent-action@3a12dbd0c6cd7dda3d4e05f24f0143c9701456de
         with:
           agent: .github/agents/release-notes-generator.yaml
           anthropic-api-key: ${{ secrets.ANTHROPIC_API_KEY }}