prefect-client has unknown prefect.__version__

[ikseek]

Bug summary

Attempt to run deployed flow via prefect-client==3.0.5 produces this error:
RuntimeError: Found incompatible versions: client: 0+unknown, server: 3.0.5. Major versions must match.

python -m pip install prefect-client==3.0.5
python -c 'import prefect; print(prefect.__version__)'

outputs 0+unknown which might be the problem.

Version info (prefect version output)

There is no `prefect` cli in `prefect-client`
3.0.5 / 0+unknown

Additional context

No response

[desertaxle]

Thanks for the bug report, @ikseek! It looks like a version check was introduced in 3.0.1 via #15252, which is where this error is coming from. The missing version on prefect-client looks like a long-standing issue that wasn't discovered until now. I will investigate and implement a fix!