Bump actions/setup-python from 5 to 6 (#3781)

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/docs.yaml

@@ -26,7 +26,7 @@ jobs:
      runs-on: ubuntu-latest
      steps:
        - uses: actions/checkout@v5
-       - uses: actions/setup-python@v5
+       - uses: actions/setup-python@v6
          with:
            python-version: 3.9
            cache: 'pip'

.github/workflows/integration.yaml

@@ -47,7 +47,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: 3.9
           cache: 'pip'
@@ -175,7 +175,7 @@ jobs:
         extension: ['tar.gz', 'whl']
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: 3.9
       - name: Run installed unit tests
@@ -194,7 +194,7 @@ jobs:
         python-version: ['3.9', '3.10', '3.11', '3.12', '3.13', 'pypy-3.9', 'pypy-3.10']
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
           cache: 'pip'

.github/workflows/pypi-publish.yaml

@@ -15,7 +15,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: install python
-        uses: actions/setup-python@v5
+        uses: actions/setup-python@v6
         with:
           python-version: 3.9
       - run: pip install build twine