Upgrade to actions/checkout v6

Author: carlosame

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     name: Integration
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Setup JDK 8
         uses: actions/setup-java@v5

.github/workflows/codeql-analysis.yml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v4