build(deps): bump actions/checkout from 6 to 7 (#264)

Bumps [actions/checkout](https://github.com/actions/checkout) from 6 to 7.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v6...v7)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/python.yml

@@ -18,7 +18,7 @@ jobs:
       matrix:
         python-version: ['3.13']
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python-version }}
@@ -41,7 +41,7 @@ jobs:
         - '3.13'
       fail-fast: false
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python-version }}
@@ -80,7 +80,7 @@ jobs:
         python-version: ['3.10']
         icalendar-version: ['4.1.2', '5.0.14']
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - uses: actions/setup-python@v6
       with: {python-version: '${{ matrix.python-version }}'}
     - run: pip install --upgrade pipenv==2023.6.18
@@ -93,7 +93,7 @@ jobs:
   install:
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - uses: actions/setup-python@v6
       with: {python-version: 3.11}
     - run: '! ical2vdir --help'
@@ -107,7 +107,7 @@ jobs:
       matrix:
         python-version: ['3.13']
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
     - uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python-version }}