Bump actions/checkout from 5 to 6 (#493)

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/build.yml

@@ -15,10 +15,10 @@ jobs:
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Checkout badges branch to a badges directory nested inside first checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         ref: badges
         path: badges

.github/workflows/codeql-analysis.yml

@@ -35,7 +35,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Set up JDK 17
       uses: actions/setup-java@v5

.github/workflows/docs.yml

@@ -16,10 +16,10 @@ jobs:
 
     steps:
     - name: Checkout the repo
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
 
     - name: Checkout the gh-pages branch
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: 0
         ref: gh-pages

.github/workflows/manual-deploy-github-only.yml

@@ -16,7 +16,7 @@ jobs:
       artifact_name: jpt
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Set up JDK 17 for deploy to github packages
       uses: actions/setup-java@v5

.github/workflows/manual-deploy.yml

@@ -16,7 +16,7 @@ jobs:
       artifact_name: jpt
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up JDK 17
       uses: actions/setup-java@v5
       with:

.github/workflows/maven-publish.yml

@@ -13,7 +13,7 @@ jobs:
       artifact_name: jpt
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: Get the release version
       id: get_version