⬆️ Bump actions/checkout from 5 to 6 (#51)

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] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/docs.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Validate Gradle Wrapper
         uses: gradle/actions/wrapper-validation@v5
       - name: Set up JDK 17

.github/workflows/publish.yml

@@ -26,7 +26,7 @@ jobs:
       ORG_GRADLE_PROJECT_signingInMemoryKeyPassword: ${{ secrets.SIGNING_PASSWORD }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Validate Gradle Wrapper
@@ -70,7 +70,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Get name, version, and group from Gradle files
         id: get_version_and_name
         run: |

.github/workflows/test.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Validate Gradle Wrapper
         uses: gradle/actions/wrapper-validation@v5
       - name: Set up JDK 17
@@ -48,7 +48,7 @@ jobs:
           - '21'
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Validate Gradle Wrapper
         uses: gradle/actions/wrapper-validation@v5
       - name: Set up JDK
@@ -74,7 +74,7 @@ jobs:
     needs: style
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Validate Gradle Wrapper
         uses: gradle/actions/wrapper-validation@v5
       - name: Set up JDK 17
@@ -98,7 +98,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up Node.js
         uses: actions/setup-node@v6
         with: