pybind11

chore(deps): bump seanmiddleditch/gha-setup-ninja in the actions group (#5509)

Bumps the 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](https://github.com/seanmiddleditch/gha-setup-ninja/compare/v5...v6)

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

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