ci(deps): bump actions/setup-python from 5 to 6 (#78)

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

.github/workflows/prchecks.yml

@@ -24,7 +24,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@v5
-    - uses: actions/setup-python@v5
+    - uses: actions/setup-python@v6
       with:
         python-version: 3.x
     - uses: psf/black@stable

.github/workflows/release.yml

@@ -12,7 +12,7 @@ jobs:
         steps:
             - uses: actions/checkout@v5
             - name: Set up Python
-              uses: actions/setup-python@v5
+              uses: actions/setup-python@v6
               with:
                 python-version: '3.x'
             - name: Setup environment

.github/workflows/tests.yml

@@ -29,7 +29,7 @@ jobs:
     steps:
     - uses: actions/checkout@v5
     - name: Set up Python ${{ matrix.python_version }}
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python_version }}
 
@@ -63,7 +63,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: Prepare Python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: "3.x"