.github: Bump regal to 0.31.0

Author: mrueg

.github/workflows/pull_request.yaml

@@ -107,7 +107,7 @@ jobs:
       - name: setup regal
         uses: styrainc/setup-regal@v1.0.0
         with:
-          version: 0.12.0
+          version: 0.31.0
 
       - name: regal lint
         run: regal lint --format github examples