Chores
- Adjust unmarshall benchmarks since they are now fast enough to hit the margin of error
([97](https://github.com/Bluetooth-Devices/dbus-fast/pull/97),
[`0ee88e4`](https://github.com/Bluetooth-Devices/dbus-fast/commit/0ee88e4018d4c436ffedb1a00136088606ba3977))
Features
- Speed up empty array unmarshall ([96](https://github.com/Bluetooth-Devices/dbus-fast/pull/96),
[`2c6ee99`](https://github.com/Bluetooth-Devices/dbus-fast/commit/2c6ee99b73dcfb2e2d45d2610a3fa10a4ff2136a))