chore: Update outdated GitHub Actions versions

Author: pgoslatara

.github/workflows/tests.yml

@@ -12,10 +12,10 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: 'lts/*'
           cache: 'npm'