fix: use GITHUB_TOKEN in label-requires-review

This check is the only one we have that uses PERSONAL_ACCESS_TOKEN,
perhaps it's expired or not present.

.github/workflows/label-requires-reviews.yml

@@ -13,4 +13,4 @@ jobs:
       - name: Require-reviewers
         uses: travelperk/label-requires-reviews-action@v0.1
         env:
-          GITHUB_TOKEN: ${{ secrets.PERSONAL_ACCESS_TOKEN}}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
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