Bump pkg-config from 1.3.8 to 1.3.9 (#12011)

Bumps [pkg-config](https://github.com/ruby-gnome/pkg-config) from 1.3.8 to 1.3.9.
- [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/1.3.8...1.3.9

)

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