Bump actions/setup-python from 5 to 6 (#60)

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

Author: dependabot[bot]

.github/workflows/continuous-integration.yml

@@ -51,7 +51,7 @@ jobs:
         mpi: ${{ matrix.mpi }}
 
     - name: Use Python ${{ matrix.py }}
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.py }}
         architecture: ${{ startsWith(matrix.os, 'macos-') && 'arm64' || 'x64' }}
@@ -104,7 +104,7 @@ jobs:
       uses: actions/checkout@v5
 
     - name: Use Python ${{ matrix.py }}
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.py }}
         architecture: ${{ startsWith(matrix.os, 'macos-') && 'arm64' || 'x64' }}

.github/workflows/release.yml

@@ -20,7 +20,7 @@ jobs:
       uses: actions/checkout@v5
 
     - name: Setup Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: 3