Bump actions/setup-python from 6 to 7

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

Author: dependabot[bot]

.github/workflows/html-macos.yml

@@ -15,7 +15,7 @@ jobs:
       run: |
         brew install pandoc
     - name: Set up Python
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@v7
       with:
         python-version: 3
     - name: Double-check Python version

.github/workflows/linkcheck.yml

@@ -16,7 +16,7 @@ jobs:
       run: |
         $APT_INSTALL pandoc
     - name: Set up Python
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@v7
       with:
         python-version: "3"
     - name: Show Python version

.github/workflows/version-matrix.yml

@@ -49,7 +49,7 @@ jobs:
       run: |
         $APT_INSTALL pandoc librsvg2-bin
     - name: Set up Python ${{ env.PYTHON_VERSION }}
-      uses: actions/setup-python@v6
+      uses: actions/setup-python@v7
       with:
         python-version: ${{ env.PYTHON_VERSION }}
     - name: Show Python version