⬆️ 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] <support@github.com>

Author: dependabot[bot]

.github/workflows/docs.yml

@@ -17,7 +17,7 @@ jobs:
     - uses: actions/checkout@v5
     - uses: pandoc/actions/setup@v1
     - uses: ts-graphviz/setup-graphviz@v2
-    - uses: actions/setup-python@v5
+    - uses: actions/setup-python@v6
       with:
         # Keep in sync with .readthedocs.yaml
         python-version-file: .python-version

.github/workflows/pre-commit.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v5
-    - uses: actions/setup-python@v5
+    - uses: actions/setup-python@v6
     - uses: actions/cache@v4
       with:
         path: ~/.cache/pre-commit