chore(project): Removed UnicodeExpr as it is no longer supported

[rhoboro]

Change Summary

mypy command gives the following error and I found python/mypy#13254 and python/mypy#12237 .
So, I removed it.

Checklist

• Unit tests for the changes exist
• Tests pass without significant drop in coverage
• Documentation reflects changes where applicable
• Test snapshots have been updated if applicable

Agreement

By submitting this pull request, I confirm that you can use, modify, copy and redistribute this contribution, under the terms of your choice.

[codecov]

Codecov Report

Base: 94.33% // Head: 94.33% // No change to project coverage 👍

Coverage data is based on head (2882dba) compared to base (c081b9b).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #526   +/-   ##
=======================================
  Coverage   94.33%   94.33%           
=======================================
  Files         120      120           
  Lines        6073     6073           
  Branches     1039      995   -44     
=======================================
  Hits         5729     5729           
  Misses        301      301           
  Partials       43       43           

Impacted Files	Coverage Δ
src/prisma/mypy.py	0.00% <0.00%> (ø)

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[RobertCraigie]

Thanks for fixing this!

It looks like UnicodeExpr was actually only used for Python 2 which I had not realised when originally writing the mypy plugin.