⬆️ Actions: Bump microsoft/PR-Metrics from 1.6.5 to 1.6.6

Bumps [microsoft/PR-Metrics](https://github.com/microsoft/pr-metrics) from 1.6.5 to 1.6.6.
- [Release notes](https://github.com/microsoft/pr-metrics/releases)
- [Commits](microsoft/PR-Metrics@v1.6.5...v1.6.6)

---
updated-dependencies:
- dependency-name: microsoft/PR-Metrics
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

.github/workflows/pr-metrics.yml

@@ -21,7 +21,7 @@ jobs:
         with:
           fetch-depth: 0
 
-      - uses: microsoft/PR-Metrics@v1.6.5
+      - uses: microsoft/PR-Metrics@v1.6.6
         name: PR Metrics
         env:
           PR_METRICS_ACCESS_TOKEN: ${{ secrets.GITHUB_TOKEN }}