Bump actions/checkout from 5 to 6 (#3560)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/CI.yml

@@ -50,7 +50,7 @@ jobs:
           LDAP_EXTRA_SCHEMAS: cosine,inetorgperson,nis,pbkdf2
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Set up JDK 21

.github/workflows/codeql-analysis.yml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Set up Maven
       uses: stCarolas/setup-maven@v5

.github/workflows/development.yml

@@ -48,7 +48,7 @@ jobs:
           LDAP_ADMIN_PASSWORD: roda
           LDAP_EXTRA_SCHEMAS: cosine,inetorgperson,nis,pbkdf2
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Set up JDK 21

.github/workflows/jekyll-gh-pages.yml

@@ -27,7 +27,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Setup Pages
         uses: actions/configure-pages@v5
       - name: Build with Jekyll

.github/workflows/latest.yml

@@ -49,7 +49,7 @@ jobs:
           LDAP_EXTRA_SCHEMAS: cosine,inetorgperson,nis,pbkdf2
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Set up JDK 21

.github/workflows/release.yml

@@ -51,7 +51,7 @@ jobs:
           LDAP_EXTRA_SCHEMAS: cosine,inetorgperson,nis,pbkdf2
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Set up JDK 21

.github/workflows/staging.yml

@@ -49,7 +49,7 @@ jobs:
           LDAP_EXTRA_SCHEMAS: cosine,inetorgperson,nis,pbkdf2
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Set up JDK 21