Bump dbus-tree from 0.9.1 to 0.9.2

Bumps [dbus-tree](https://github.com/diwic/dbus-rs) from 0.9.1 to 0.9.2.
- [Release notes](https://github.com/diwic/dbus-rs/releases)
- [Commits](https://github.com/diwic/dbus-rs/compare/dbus-tree-v0.9.1...dbus-tree-v0.9.2)

---
updated-dependencies:
- dependency-name: dbus-tree
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Cargo.toml

@@ -37,7 +37,7 @@ tokio-stream = "0.1.7"
 toml = "0.5"
 unicode-width = "0.1.9"
 dbus = { version = "0.9.5", optional = true }
-dbus-tree = { version = "0.9.0", optional = true }
+dbus-tree = { version = "0.9.2", optional = true }
 rand = "0.8"
 webbrowser = "0.5"
 clipboard = { version = "0.5", optional = true }