CI: labeler: target major version of labeler action

Target major version of labeler to include minor fixes and use always
the latest major version with included fixes.

Signed-off-by: Christian Marangi <[email protected]>

.github/workflows/labeler.yml

@@ -14,6 +14,6 @@ jobs:
     name: Pull Request Labeler
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/labeler@v4.0.1
+      - uses: actions/labeler@v4
         with:
           repo-token: '${{ secrets.GITHUB_TOKEN }}'