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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5.0.0
+    - uses: actions/checkout@v6.0.0
     - name: set up JDK 18
       uses: actions/setup-java@v5
       with:

.github/workflows/publish.yml

@@ -10,7 +10,7 @@ jobs:
     name: Test
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5.0.0
+    - uses: actions/checkout@v6.0.0
     - name: Set up JDK 18
       uses: actions/setup-java@v5
       with:
@@ -28,7 +28,7 @@ jobs:
     needs: [test]
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5.0.0
+    - uses: actions/checkout@v6.0.0
     - name: Set up JDK 18
       uses: actions/setup-java@v5
       with: