chore(deps): bump libdbus-sys from 0.2.3 to 0.2.4

Bumps [libdbus-sys](https://github.com/diwic/dbus-rs) from 0.2.3 to 0.2.4.
- [Release notes](https://github.com/diwic/dbus-rs/releases)
- [Commits](diwic/dbus-rs@libdbus-sys-v0.2.3...libdbus-sys-v0.2.4)

---
updated-dependencies:
- dependency-name: libdbus-sys
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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