Update actions/checkout action to v6 (#719)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/codeql-analysis.yml

@@ -18,7 +18,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         # We must fetch at least the immediate parents so that if this is
         # a pull request then we can checkout the head.

.github/workflows/graalvm.yml

@@ -48,7 +48,7 @@ jobs:
           # gds-token: # optional
 
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           # We must fetch at least the immediate parents so that if this is
           # a pull request then we can checkout the head.

.github/workflows/main.yml

@@ -22,7 +22,7 @@ jobs:
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       # Runs a single command using the runners shell
       - name: Run a one-line script

.github/workflows/maven.yml

@@ -17,7 +17,7 @@ jobs:
 
     steps:
     - name: Checkout sources
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Set up JDK 11
       uses: actions/setup-java@v5

.github/workflows/meterian.yml

@@ -14,7 +14,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
           - name: Checkout
-            uses: actions/checkout@v5
+            uses: actions/checkout@v6
           - name: Scan project with the Meterian client
             uses: MeterianHQ/meterian-github-action@v1.0.17
             env: