chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/audit.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         submodules: recursive
 
@@ -83,7 +83,7 @@ jobs:
     steps:
       # Checkout the repository and submodules
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           submodules: recursive