CI: bump actions/checkout to v5 for Node.js 24 compatibility

Author: auanasgheps

.github/workflows/tests.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
 
       - name: Install dependencies
         run: sudo apt-get update -qq && sudo apt-get install -y bats bc