RC versions of dependencies don't satisfy the run-time dependency checker; `Need Twisted>=18.9.0, but got Twisted==21.7.0rc3` (1.54.0rc1 suspected regression)

[reivilibre]

When deploying 1.54.0rc1 to matrix.org and some personal homeservers that had an RC of Twisted installed, the dependency checker complained:

Need Twisted>=18.9.0, but got Twisted==21.7.0rc3

For some reason it appears that being an RC makes the version insufficient, even though the version is higher. Using the non-RC version works fine.

Possibly fall-out from #12088?

I wonder if the same logic as e.g. pip is being used, in that it would never select an RC version as being satisfactory unless it was a hard match?

[H-Shay]

Since the fix to this has merged I am going to close this issue.