Bump actions/checkout from 5 to 6

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]>

Author: dependabot[bot]

.github/workflows/publish-ghpages.yml

@@ -16,7 +16,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0
     - name: cache sbt packages

.github/workflows/publish-sonatype.yml

@@ -7,7 +7,7 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: coursier/cache-action@v7

.github/workflows/run-tests.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     name: Test-${{ matrix.os }}-${{ matrix.java }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: coursier/cache-action@v7
     - uses: coursier/setup-action@v1
       with:
@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest
     name: MigrationManager
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: coursier/cache-action@v7
     - uses: coursier/setup-action@v1
       with:
@@ -44,7 +44,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     name: Artifact-${{ matrix.os }}-${{ matrix.java }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0
     - uses: coursier/cache-action@v7