feat: turn warnings about missing post-processed histograms into info messages

[alexander-held]

The WARNING log level when histogram post-processing is not called seemed a bit too high. This is now an INFO level message instead.

Extending the typeguard version restrictions to handle #428.

resolves #432

* lower warning-level messages when histogram post-processing is not used to info-level messages
* temporarily restrict more typeguard versions to avoid typing_extensions conflict due to TensorFlow

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (a0638e1) 100.00% compared to head (89bad89) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #436   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           22        22           
  Lines         2072      2071    -1     
  Branches       338       338           
=========================================
- Hits          2072      2071    -1     

Files Changed	Coverage Δ
src/cabinetry/histo.py	100.00% <100.00%> (ø)

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