trussed.updates: SDK version check does not handle release candidates

[robin-nitrokey]

When trying to perform a firmware update with Nitrokey App 2 v2.6.0:

9409      ERROR nitrokeyapp.device_data Nitrokey 3 update failed: UpdateResult(model=<Model.NK3: 'Nitrokey 3'>, status=<UpdateStatus.ERROR: 'error'>, message='Invalid component in firmware version: 0.5.0rc1')

Probably caused by:

nitrokey-sdk-py/src/nitrokey/trussed/updates.py

Line 424 in 1f15d1a

sdk_version = Version.from_str(importlib.metadata.version("nitrokey"))