update action

Author: CorrectRoadH

.github/workflows/validate-openapi.yaml

@@ -13,12 +13,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Set up Node.js
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v4
         with:
-          node-version: '14'
+          node-version: '20'
 
       - name: Install OpenAPI CLI
         run: npm install -g @redocly/openapi-cli