Bump actions/setup-python from 5 to 6

Bumps [actions/setup-python](https://github.com/actions/setup-python) from 5 to 6.
- [Release notes](https://github.com/actions/setup-python/releases)
- [Commits](actions/setup-python@v5...v6)

---
updated-dependencies:
- dependency-name: actions/setup-python
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/main.yml

@@ -31,7 +31,7 @@ jobs:
     steps:
     - uses: actions/checkout@v5
     - name: Set up Python ${{ env.PYTHON_VERSION }}
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: ${{ env.PYTHON_VERSION }}
     - name: Install and run black for notebooks
@@ -58,7 +58,7 @@ jobs:
         restore-keys: |
           notebook-data-${{ hashFiles('data/manifest.json') }}
     - name: Set up Python ${{ env.PYTHON_VERSION }}
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: ${{ env.PYTHON_VERSION }}
     - name: Install enchant on non windows systems