Bump log from 0.4.20 to 0.4.21 (#231)

Bumps [log](https://github.com/rust-lang/log) from 0.4.20 to 0.4.21.
- [Release notes](https://github.com/rust-lang/log/releases)
- [Changelog](https://github.com/rust-lang/log/blob/master/CHANGELOG.md)
- [Commits](rust-lang/log@0.4.20...0.4.21)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

bluez-async/Cargo.toml

@@ -17,7 +17,7 @@ dbus = { version = "0.9.7", features = ["futures"] }
 dbus-tokio = "0.7.6"
 futures = "0.3.30"
 itertools = "0.12.1"
-log = "0.4.20"
+log = "0.4.21"
 serde = { version = "1.0.197", features = ["derive"] }
 serde-xml-rs = "0.6.0"
 thiserror = "1.0.57"