Added logic to NotebookImportExtractor to guess the encoding on initi…

[fpgmaas]

…al UnicodeDecodeError

PR Checklist

• A description of the changes is added to the description of this PR.
• If there is a related issue, make sure it is linked to this PR.
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

Description of changes

[mkniewallner]

Some nits, but non-blockers, so approving.

[fpgmaas]

Some nits, but non-blockers, so approving.

Thanks for reviewing!

[codecov-commenter]

Codecov Report

Merging #216 (77c229c) into main (ea7ba57) will decrease coverage by 0.5%.
The diff coverage is 75.0%.

@@           Coverage Diff           @@
##            main    #216     +/-   ##
=======================================
- Coverage   96.2%   95.7%   -0.6%     
=======================================
  Files         31      31             
  Lines        897     907     +10     
  Branches     201     203      +2     
=======================================
+ Hits         863     868      +5     
- Misses        22      26      +4     
- Partials      12      13      +1     

Impacted Files	Coverage Δ
...ptry/imports/extractors/python_import_extractor.py	100.0% <ø> (ø)
...ry/imports/extractors/notebook_import_extractor.py	88.0% <66.6%> (-12.0%)	⬇️
deptry/imports/extractors/base.py	96.0% <100.0%> (+1.0%)	⬆️

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