ci: Upgrade PR labeler

Adds a new label's category for Pull Request size.
The labels are based on the number of altered lines.

.github/workflows/labeler.yml

@@ -26,6 +26,7 @@ jobs:
     permissions:
       contents: read
       pull-requests: write
+      issues: write
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
@@ -36,3 +37,9 @@ jobs:
         with:
           sync-labels: true
           configuration-path: .github/labeler_cfg.yml
+
+      - name: Assign labels based on the PR's size
+        uses: codelytv/pr-size-labeler@v1.10.0
+        with:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          ignore_file_deletions: true