Update check-restricted-files.yaml

Author: ralfhandl

.github/workflows/check-restricted-files.yaml

@@ -30,7 +30,7 @@ jobs:
               exit 0
             fi
 
-            if [[ "${{ github.event.pull_request.head.ref }}" =~ ^"v[0-9]+\.[0-9]+\.[0-9]+-rel" ]] && \
+            if [[ "${{ github.event.pull_request.head.ref }}" =~ ^v[0-9]+\.[0-9]+\.[0-9]+-rel$ ]] && \
                [[ "${{ github.event.pull_request.base.ref }}" == "main" ]]; then
               echo Release from ${{ github.event.pull_request.head.ref }} to main
               exit 0