mgr: add urllib3==1.26.15 to mgr/requirements.txt

[ljflores]

We do not depend on any particular version of urllib3, but as a workaround to the incompatibility of urllib3 constraints between kubernetes and requests, we need to pin it temporarily to the version both are happy with.

When requests is compatible with a higher urllib3 version, we can unpin it again.

See https://tracker.ceph.com/issues/48210 for the history of this happening before.

Fixes: https://tracker.ceph.com/issues/59591
Signed-off-by: Laura Flores lflores@redhat.com

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[adk3798]

2289ad2 seemed to imply the main reason for setting the constraint on the version of requests was because it needed to be at least 2.26. I wonder if it's possible to relax that requirement to something like >=2.26 and if that would make a difference. The patch in this PR has gotten the setup-venv-for-mgr passing though so maybe it's best to just do this in order to unblock make check. Just thinking with this we'll have to remember to one day remove this pin the same as what happened with https://tracker.ceph.com/issues/48210

[adk3798]

Gets make check passing, so as a temporary solution LGTM

[ljflores]

Going to merge this as a workaround for now. I'm also adding a note to the tracker that if we experience any issues in the future with urllib3, we should consider unpinning it.

[dmick]

agreed that I don't know why requests was exactly pinned to 2.26, but, pinning is so evil anyway