Putting the variable inside double quotes

Signed-off-by: RD WebDesign <github@rdwebdesign.com.br>

.github/workflows/stale.yml

@@ -39,7 +39,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3.5.2
       - name: Remove 'stale' label
-        run: gh issue edit ${{ github.event.issue.number }} --remove-label $stale_label
+        run: gh issue edit ${{ github.event.issue.number }} --remove-label "$stale_label"
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}