Pin Renovate validator in devDependencies

Author: JustinBeckwith

.github/workflows/ci.yaml

@@ -51,4 +51,9 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
         with:
           persist-credentials: false
-      - run: npx --yes --package renovate -- renovate-config-validator --strict
+      - uses: actions/setup-node@53b83947a5a98c8d113130e565377fae1a50d02f # v6.3.0
+        with:
+          node-version: 24
+          cache: npm
+      - run: npm ci
+      - run: npm run renovate-config