Bump actions/checkout from 4 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/codeql-analysis.yml

@@ -36,7 +36,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       # Initializes the CodeQL tools for scanning.
       - name: Initialize CodeQL

.github/workflows/maven.yml

@@ -27,7 +27,7 @@ jobs:
     # Run steps
     steps:
       # Pull changes
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       # Setup Java
       - name: Set up JDK
@@ -52,7 +52,7 @@ jobs:
     # Run steps
     steps:
       # Pull changes
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       # Setup Java
       - name: Set up JDK