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

Author: renovate[bot]

.github/workflows/maven.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: "Set up JDK"
         uses: actions/setup-java@v5
         with:

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: "Set up JDK"
         uses: actions/setup-java@v5