Plots.jl pythonplot() matplotlib downgrading

When attempting to plot three aligned subplots in Plots.jl’s pythonplot() backend, the following error message is displayed:

ERROR: Python: AttributeError: 'GrouperView' object has no attribute 'join' Python stacktrace: none

The same error was reported in SO and a recommendation was given to downgrade matplotlib to 3.7 or 3.6.

How to perform such a downgrade?

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