Bump cairo-rs from 0.19.2 to 0.19.4

Bumps [cairo-rs](https://github.com/gtk-rs/gtk-rs-core) from 0.19.2 to 0.19.4.
- [Release notes](https://github.com/gtk-rs/gtk-rs-core/releases)
- [Changelog](https://github.com/gtk-rs/gtk-rs-core/blob/master/CHANGELOG.md)
- [Commits](gtk-rs/gtk-rs-core@0.19.2...0.19.4)

---
updated-dependencies:
- dependency-name: cairo-rs
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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