Bump actions/checkout from 6.0.2 to 6.0.3

Bumps [actions/checkout](https://github.com/actions/checkout) from 6.0.2 to 6.0.3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v6.0.2...v6.0.3)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: 6.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

.github/workflows/build.yml

@@ -36,7 +36,7 @@ jobs:
           python-version: "3.11"
       - name: install tox
         run: python -m pip install tox
-      - uses: actions/checkout@v6.0.2
+      - uses: actions/checkout@v6.0.3
       - name: setup python for test ${{ matrix.py }}
         uses: actions/setup-python@v6
         with:
@@ -50,7 +50,7 @@ jobs:
     name: check docs
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v6.0.2
+      - uses: actions/checkout@v6.0.3
       - name: setup Python 3.14
         uses: actions/setup-python@v6
         with:
@@ -66,7 +66,7 @@ jobs:
     name: lint
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v6.0.2
+      - uses: actions/checkout@v6.0.3
       # mypy needs to be run with the oldest Python version we support.
       - name: setup Python 3.8
         uses: actions/setup-python@v6

.github/workflows/build_dist.yml

@@ -19,7 +19,7 @@ jobs:
     name: Source and wheel distributions
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6.0.2
+      - uses: actions/checkout@v6.0.3
 
       - name: Build distributions
         run: pipx run build[virtualenv] --sdist --wheel