chore(deps): update actions/checkout action to v7 (#20)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -7,13 +7,13 @@ jobs:
       matrix:
         python-version: ["3.10", "3.11", "3.12", "3.13"]
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: astral-sh/setup-uv@v8.2.0
       - run: uv run nox -s "tests-${{ matrix.python-version }}"
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: astral-sh/setup-uv@v8.2.0
       - run: uv run nox -s lint
   publish:
@@ -23,7 +23,7 @@ jobs:
     permissions:
       id-token: write
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - uses: astral-sh/setup-uv@v8.2.0
       - run: uv build
       - uses: pypa/gh-action-pypi-publish@release/v1