build(deps): bump zbus from 3.15.0 to 4.1.2

Bumps [zbus](https://github.com/dbus2/zbus) from 3.15.0 to 4.1.2.
- [Release notes](https://github.com/dbus2/zbus/releases)
- [Commits](dbus2/zbus@zbus-3.15.0...zbus-4.1.2)

---
updated-dependencies:
- dependency-name: zbus
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

crates/server/Cargo.toml

@@ -32,7 +32,7 @@ tokio-stream = { version = "0.1", features = ["net"] }
 
 tonic = { version = "0.11", features = ["gzip"] }
 
-zbus     = { version = "3", default-features = false, features = ["tokio"] }
+zbus     = { version = "4", default-features = false, features = ["tokio"] }
 zvariant = "3"
 
 hex = "0.4"