chore: update from node 10 to 20 in main.yml action

.github/workflows/main.yml

@@ -14,7 +14,7 @@ jobs:
       - uses: actions/checkout@master
       - uses: actions/setup-node@v1
         with:
-          node-version: '10.x'      # This step prints an output (time) from the previous step's action.
+          node-version: '20'
       - run: npm install
       - name: Validate
         uses: ./