Bump pkg-config from 1.4.1 to 1.4.9

Bumps [pkg-config](https://github.com/ruby-gnome/pkg-config) from 1.4.1 to 1.4.9.
- [Release notes](https://github.com/ruby-gnome/pkg-config/releases)
- [Changelog](https://github.com/ruby-gnome/pkg-config/blob/master/NEWS)
- [Commits](https://github.com/ruby-gnome/pkg-config/compare/1.4.1...1.4.9

)

---
updated-dependencies:
- dependency-name: pkg-config
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>