Bump actions/checkout from 5.0.1 to 6.0.0 (#859)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5.0.1 to 6.0.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5.0.1...v6.0.0)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.0
  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/generate_changelog.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Generate changelog for master branch
     steps:
-      - uses: actions/checkout@v5.0.1
+      - uses: actions/checkout@v6.0.0
         with:
           ref: master
 

.github/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
       id-token: write # IMPORTANT: this permission is mandatory for trusted publishing
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5.0.1
+      - uses: actions/checkout@v6.0.0
       - name: Set up Python 3.9
         uses: actions/[email protected]
         with:

.github/workflows/test.yml

@@ -22,7 +22,7 @@ jobs:
           - "3.13"
 
     steps:
-      - uses: actions/checkout@v5.0.1
+      - uses: actions/checkout@v6.0.0
       - name: Set up Python ${{ matrix.python-version }}
         uses: actions/[email protected]
         with: