chore(deps): bump pango from 0.19.5 to 0.20.0

Bumps [pango](https://github.com/gtk-rs/gtk-rs-core) from 0.19.5 to 0.20.0.
- [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@0.19.5...0.20.0)

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

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