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/ci.yaml

@@ -46,7 +46,7 @@ jobs:
       - uses: actions/setup-go@v5
         with:
           go-version-file: go.mod
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: 3.12
       - uses: hynek/setup-cached-uv@v2
@@ -116,7 +116,7 @@ jobs:
         run: echo COG_WHEEL=$(ls dist/*.whl) >>"$GITHUB_ENV"
       - name: Extract source distribution
         run: tar xf dist/*.tar.gz --strip-components=1
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
       - uses: hynek/setup-cached-uv@v2
@@ -170,7 +170,7 @@ jobs:
       - uses: actions/setup-go@v5
         with:
           go-version-file: go.mod
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: 3.12
       - uses: hynek/setup-cached-uv@v2

.github/workflows/docs.yaml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: '3.13'