Bump workflow versions (#351)

Author: rslawik

.github/workflows/tests.yml

@@ -4,9 +4,10 @@ jobs:
   tests:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-node@v2
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
         with:
+          node-version: node
           cache: 'npm'
       - run: npm ci
       - run: npm test