chore: use def import_module from importlib

[nijel]

There is no reason to implement it.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.99%. Comparing base (7067970) to head (3ccde67).
⚠️ Report is 20 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1500   +/-   ##
=======================================
  Coverage   78.98%   78.99%           
=======================================
  Files         354      354           
  Lines       11518    11511    -7     
  Branches      531      530    -1     
=======================================
- Hits         9098     9093    -5     
+ Misses       2237     2236    -1     
+ Partials      183      182    -1     

Flag	Coverage Δ
unittests	78.99% <100.00%> (+<0.01%)	⬆️

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