chore: update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/CI.yml

@@ -6,7 +6,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Use Node.js
       uses: actions/setup-node@v6
       with:

.github/workflows/CODEQL_ANALYSIS.yml

@@ -35,7 +35,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL

.github/workflows/PUBLISH_DOCKER.yml

@@ -14,7 +14,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Login to Docker Hub
       uses: docker/login-action@v3