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] <support@github.com>

Author: dependabot[bot]

.github/workflows/build-release.yml

@@ -19,7 +19,7 @@ jobs:
  - { name: "mypy-ma3", python: "3.13", tox: mypy-marshmallow3 }
  - { name: "mypy-madev", python: "3.13", tox: mypy-marshmallowdev }
  steps:
- - uses: actions/checkout@v5
+ - uses: actions/checkout@v6
  - uses: actions/setup-python@v6
  with:
  python-version: ${{ matrix.python }}
@@ -29,7 +29,7 @@ jobs:
  name: Build package
  runs-on: ubuntu-latest
  steps:
- - uses: actions/checkout@v5
+ - uses: actions/checkout@v6
  - uses: actions/setup-python@v6
  with:
  python-version: "3.13"
@@ -52,7 +52,7 @@ jobs:
  if: startsWith(github.ref, 'refs/tags')
  runs-on: ubuntu-latest
  steps:
- - uses: actions/checkout@v5
+ - uses: actions/checkout@v6
  - uses: actions/setup-python@v6
  with:
  python-version: "3.13"