Bump winit from 0.27.5 to 0.28.0

Bumps [winit](https://github.com/rust-windowing/winit) from 0.27.5 to 0.28.0.
- [Release notes](https://github.com/rust-windowing/winit/releases)
- [Changelog](https://github.com/rust-windowing/winit/blob/master/CHANGELOG.md)
- [Commits](rust-windowing/winit@v0.27.5...v0.28.0)

---
updated-dependencies:
- dependency-name: winit
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>