ci(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] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ${{ vars.RUNNER_LABEL || 'blacksmith-2vcpu-ubuntu-2404' }}
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
       - run: pip install ruff
@@ -27,7 +27,7 @@ jobs:
     runs-on: ${{ vars.RUNNER_LABEL || 'blacksmith-2vcpu-ubuntu-2404' }}
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
       - run: pip install -e ".[dev]" mypy types-PyYAML
@@ -43,7 +43,7 @@ jobs:
         python-version: ["3.10", "3.11", "3.12"]
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: ${{ matrix.python-version }}
       - run: pip install -e ".[dev]" pytest-cov
@@ -56,7 +56,7 @@ jobs:
     runs-on: ${{ vars.RUNNER_LABEL || 'blacksmith-2vcpu-ubuntu-2404' }}
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@v6
         with:
           python-version: "3.12"
       - run: python -m pip install --upgrade pip