Bump actions/labeler from 6.1.0 to 7.0.0 (#319)

Author: frequenz-auto-dependabot[bot]

.github/workflows/labeler.yml

@@ -20,7 +20,7 @@ jobs:
         # only use hashes to pick the action to execute (instead of tags or branches).
         # For more details read:
         # https://securitylab.github.com/research/github-actions-preventing-pwn-requests/
-        uses: actions/labeler@f27b608878404679385c85cfa523b85ccb86e213  # 6.1.0
+        uses: actions/labeler@bf12e9b00b37c5c0ca2b87b79b2daf7891dbda13  # 7.0.0
         with:
           repo-token: "${{ secrets.GITHUB_TOKEN }}"
           dot: true