Bump actions/checkout from 6 to 7

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/build.yml

@@ -25,7 +25,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     name: Build on ${{ matrix.os }} on Java ${{ matrix.java }}
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: gradle/actions/wrapper-validation@v6
       - name: Set up JDK ${{ matrix.java }}
         uses: actions/setup-java@v5

.github/workflows/nightly.yml

@@ -13,7 +13,7 @@ jobs:
       contents: write
       pull-requests: write
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           fetch-depth: 0
       - uses: gradle/actions/wrapper-validation@v6

.github/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Release
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: gradle/actions/wrapper-validation@v6
       - name: Set up JDK
         uses: actions/setup-java@v5

.github/workflows/security.yml

@@ -13,7 +13,7 @@ jobs:
       actions: read
       security-events: write
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: gradle/actions/wrapper-validation@v6
       - name: Use JDK 25
         uses: actions/setup-java@v5