Bumps [servo-fontconfig](https://github.com/servo/rust-fontconfig) from 0.5.0 to 0.5.1.
- [Release notes](https://github.com/servo/rust-fontconfig/releases)
- [Commits](https://github.com/servo/rust-fontconfig/commits/v0.5.1)

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