⬆️ Actions: Bump microsoft/PR-Metrics from 1.7.7 to 1.7.9

Bumps [microsoft/PR-Metrics](https://github.com/microsoft/pr-metrics) from 1.7.7 to 1.7.9.
- [Release notes](https://github.com/microsoft/pr-metrics/releases)
- [Commits](microsoft/PR-Metrics@v1.7.7...v1.7.9)

---
updated-dependencies:
- dependency-name: microsoft/PR-Metrics
  dependency-version: 1.7.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/pr-metrics.yml

@@ -21,7 +21,7 @@ jobs:
         with:
           fetch-depth: 0
 
-      - uses: microsoft/[email protected].7
+      - uses: microsoft/[email protected].9
         name: PR Metrics
         env:
           PR_METRICS_ACCESS_TOKEN: ${{ secrets.GITHUB_TOKEN }}