Pin dependencies for py36 compatibility [train backport] #637
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macaroonbakery in version 1.3.4 started depending on protobuf>3.20 which it's not compatible with python 3.6, so this change pins macaroonbakery to 1.3.2 which was the last release compatible with older versions of protobuf.
For more details see:
It's worth to mention that there is no protobuf-4.0, it goes from 3.20 to 4.21 - https://pypi.org/project/protobuf/#history
(cherry picked from commit a8e4de5) (cherry picked from commit 300c5bb)