Bump actions/checkout from 5 to 6 (#701)

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/build-and-test.yml

@@ -27,7 +27,7 @@ jobs:
         os: [ ubuntu-latest, windows-latest, macos-latest ]
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v5
         with:
@@ -47,7 +47,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v5
         with:

.github/workflows/fantomas-check.yml

@@ -17,7 +17,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Restore packages
         run: dotnet tool restore
       - name: Run Fantomas

.github/workflows/publish.yml

@@ -29,7 +29,7 @@ jobs:
         os: [ ubuntu-latest, windows-latest, macos-latest ]
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v5
         with:
@@ -50,7 +50,7 @@ jobs:
     needs: build
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Setup .NET Core
         uses: actions/setup-dotnet@v5
         with: