ci: run Issue guard on supported Node 22

.github/workflows/issue-submission-guard.yml

@@ -30,7 +30,7 @@ jobs:
           sparse-checkout-cone-mode: false
       - uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v7.0.0
         with:
-          node-version: '20.x'
+          node-version: '22.x'
       - name: Enforce Issue submission policy
         env:
           GITHUB_TOKEN: ${{ github.token }}