Bump libdbus-sys from 0.2.2 to 0.2.4

Bumps [libdbus-sys](https://github.com/diwic/dbus-rs) from 0.2.2 to 0.2.4.
- [Release notes](https://github.com/diwic/dbus-rs/releases)
- [Commits](https://github.com/diwic/dbus-rs/compare/libdbus-sys-v0.2.2...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>

Cargo.lock

@@ -3379,9 +3379,9 @@ checksum = "efaa7b300f3b5fe8eb6bf21ce3895e1751d9665086af2d64b42f19701015ff4f"
 
 [[package]]
 name = "libdbus-sys"
-version = "0.2.2"
+version = "0.2.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c185b5b7ad900923ef3a8ff594083d4d9b5aea80bb4f32b8342363138c0d456b"
+checksum = "9f8d7ae751e1cb825c840ae5e682f59b098cdfd213c350ac268b61449a5f58a0"
 dependencies = [
  "pkg-config",
 ]