Avoid broken macaroonbakery release

[coreycb]

macaroonbakery 1.3.3 has a broken protobuf dependency, add a requirement to avoid that specific release:
go-macaroon-bakery/py-macaroon-bakery#94

(cherry picked from commit 8be4948)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (109d0f7) 89.15% compared to head (8e48693) 89.15%.

Additional details and impacted files

@@               Coverage Diff                @@
##           stable/antelope     #625   +/-   ##
================================================
  Coverage            89.15%   89.15%           
================================================
  Files                   44       44           
  Lines                 4677     4677           
================================================
  Hits                  4170     4170           
  Misses                 507      507           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[freyes]

we need a stable/bobcat backport.

[freyes]

This is fixing the build via updating the requirements.txt only, on that basis I'm merging with a single +2 to unblock the gate.

The fix for stable/bobcat was in the queue and I didn't notice it, it got merged by now.