Build(deps): 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

@@ -27,7 +27,7 @@ jobs:
       with:
         fetch-depth: 0
         persist-credentials: false
-    - uses: actions/setup-python@v5
+    - uses: actions/setup-python@v6
       with:
         python-version: ${{ env.PYTHON_LATEST }}
     - name: Install tox
@@ -55,7 +55,7 @@ jobs:
       with:
         fetch-depth: 0
         persist-credentials: false
-    - uses: actions/setup-python@v5
+    - uses: actions/setup-python@v6
       with:
         python-version: ${{ env.PYTHON_LATEST }}
     - name: Install GitHub matcher for ActionLint checker
@@ -88,7 +88,7 @@ jobs:
     - uses: actions/checkout@v5
       with:
         persist-credentials: false
-    - uses: actions/setup-python@v5
+    - uses: actions/setup-python@v6
       with:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
@@ -127,7 +127,7 @@ jobs:
     - uses: actions/checkout@v5
       with:
         persist-credentials: false
-    - uses: actions/setup-python@v5
+    - uses: actions/setup-python@v6
       with:
         python-version: ${{ env.PYTHON_LATEST }}
     - name: Install Coverage.py
@@ -164,7 +164,7 @@ jobs:
         fetch-depth: 0
         persist-credentials: false
     - name: Install Python
-      uses: actions/setup-python@v5
+      uses: actions/setup-python@v6
     - name: Install towncrier
       run: pip install towncrier==24.8.0
     - name: Install pandoc