chore: update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/CI.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: Use Node.js
       uses: actions/setup-node@v6
       with:

.github/workflows/CODE_SCANNING.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL

.github/workflows/MERGE_MAIN_TO_DEVELOP.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
     - name: Checkout develop
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         ref: develop
         fetch-depth: 0