build(deps): bump actions/setup-python from 6 to 7 (#270)

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 6 to 7.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](https://github.com/actions/setup-python/compare/v6...v7)

---
updated-dependencies:
- dependency-name: actions/setup-python
  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

@@ -19,7 +19,7 @@ jobs:
         python-version: ['3.13']
     steps:
     - uses: actions/checkout@v7
-    - uses: actions/setup-python@v6
+    - uses: actions/setup-python@v7
       with:
         python-version: ${{ matrix.python-version }}
         # did not reduce runtime of `pipenv install` (still approx. 1 min)
@@ -42,7 +42,7 @@ jobs:
       fail-fast: false
     steps:
     - uses: actions/checkout@v7
-    - uses: actions/setup-python@v6
+    - uses: actions/setup-python@v7
       with:
         python-version: ${{ matrix.python-version }}
         # did not reduce runtime of `pipenv install` (still approx. 1 min)
@@ -81,7 +81,7 @@ jobs:
         icalendar-version: ['4.1.2', '5.0.14']
     steps:
     - uses: actions/checkout@v7
-    - uses: actions/setup-python@v6
+    - uses: actions/setup-python@v7
       with: {python-version: '${{ matrix.python-version }}'}
     - run: pip install --upgrade pipenv==2023.6.18
     - run: pipenv install --python "$PYTHON_VERSION" --deploy --dev
@@ -94,7 +94,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
     - uses: actions/checkout@v7
-    - uses: actions/setup-python@v6
+    - uses: actions/setup-python@v7
       with: {python-version: 3.11}
     - run: '! ical2vdir --help'
     - run: pip install wheel==0.45.1
@@ -108,7 +108,7 @@ jobs:
         python-version: ['3.13']
     steps:
     - uses: actions/checkout@v7
-    - uses: actions/setup-python@v6
+    - uses: actions/setup-python@v7
       with:
         python-version: ${{ matrix.python-version }}
     - run: pip install --upgrade pipenv==2025.0.4