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As discussed at today's cinder meeting, there are patches available that 
address the lower constraints problems arising from the upgraded pip 
dependency resolver for most cinder deliverables.

Except for master, I've tried to keep the changes minimal.  One possibly 
controversial change has been to add indirect dependencies to 
test-requirements.txt in a few cases where the version range was so wide 
that the resolver was taking a very long time to figure out a 
satisfactory resolution.  An example of this is the cinder stable/train 
patch:
   https://review.opendev.org/c/openstack/cinder/+/767954

I'm not sure when these patches will be merged, but you can always add 
the appropriate one as a dependency in gerrit to get the check jobs to 
pass on your patch.  You can find them by using the gerrit hashtag 
'fix-l-c':
   https://review.opendev.org/q/hashtag:fix-l-c

Apparently only the owner of a review can add a hashtag, so 
os-brick/master (merged, owned by lpetrut) and the patches for the 
non-releaseable stable branches that e0ne is working on aren't in the 
list yet.