chore(deps): bump actions/setup-python from 5 to 6 (#653)

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
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
         with:
           submodules: "recursive"
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.11"
 

.github/workflows/test-python.yml

@@ -20,7 +20,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
 
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.11"
 

.github/workflows/wheels.yml

@@ -136,7 +136,7 @@ jobs:
       # executables, so we use the Python versions provided by github actions
       # for now.
       # Seems to be this question: https://stackoverflow.com/questions/78557803/python-with-rust-cannot-open-input-file-python3-lib
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: 3.13
           architecture: ${{ matrix.platform.target }}
@@ -235,7 +235,7 @@ jobs:
           pattern: wheels-*-obstore
           merge-multiple: true
           path: dist
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: 3.13