Bump actions/setup-python from 5 to 6 (#100)

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

Author: dependabot[bot]

.github/workflows/publish_to_pypi.yml

@@ -15,7 +15,7 @@ jobs:
               uses: astral-sh/setup-uv@v6
 
             - name: Set up Python
-              uses: actions/setup-python@v5
+              uses: actions/setup-python@v6
               with:
                   python-version: "3.9"
 

.github/workflows/run_tests.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v6
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
       - name: install dependencies
@@ -34,7 +34,7 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v6
       - name: Set up Python ${{ matrix.python-version }}
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
       - name: install dependencies