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 (19f5d2b) 89.12% compared to head (b7d5d82) 89.12%.

Additional details and impacted files

@@             Coverage Diff             @@
##           stable/zed     #626   +/-   ##
===========================================
  Coverage       89.12%   89.12%           
===========================================
  Files              44       44           
  Lines            4651     4651           
===========================================
  Hits             4145     4145           
  Misses            506      506           

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[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.