chore(deps): bump seanmiddleditch/gha-setup-ninja (#283)

Bumps the github_actions group with 1 update: [seanmiddleditch/gha-setup-ninja](https://github.com/seanmiddleditch/gha-setup-ninja).


Updates `seanmiddleditch/gha-setup-ninja` from 5 to 6
- [Release notes](https://github.com/seanmiddleditch/gha-setup-ninja/releases)
- [Commits](seanmiddleditch/gha-setup-ninja@v5...v6)

---
updated-dependencies:
- dependency-name: seanmiddleditch/gha-setup-ninja
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: github_actions
...

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Author: dependabot[bot]

.github/workflows/python_tests.yml

@@ -23,7 +23,7 @@ jobs:
         with:
           python-version: ${{ matrix.python-version }}
           allow-prereleases: true
-      - uses: seanmiddleditch/gha-setup-ninja@v5
+      - uses: seanmiddleditch/gha-setup-ninja@v6
       - name: Install dependencies
         run: |
           python -m pip install --upgrade pip