Bump actions/checkout from 4.2.2 to 6.0.3

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.2.2 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@11bd719...df4cb1c)

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

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10  # v6.0.3
       - uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b  # v8.1.0
       - run: uv run pytest --ignore=tests/test_e2e.py --ignore=tests/test_e2e_tracing.py
 
@@ -33,7 +33,7 @@ jobs:
       # short-lived (~1h); rotate when CI starts failing with 401s.
       DATABRICKS_BEARER: ${{ secrets.DATABRICKS_BEARER }}
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
+      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10  # v6.0.3
       - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020  # v4
       - uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b  # v8.1.0
       - uses: databricks/setup-cli@bdb89f81c11a5bd647fd55b585b7c396ec68a25a  # v1.0.0