Remove unused _ENCODING_PATTERN regex and re import

[duriantaco]

Hihi! doing some cleanup!

Found some dead code here .. _ENCODING_PATTERN in isort/io.py is a compiled regex that is never referenced anywhere in the codebase. Removed along with the now-unused import re.

Dead code was identified using Skylos.

[DanielNoord]

If CI is green this LGTM :)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.15%. Comparing base (048e370) to head (d97047d).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2525      +/-   ##
==========================================
- Coverage   99.15%   99.15%   -0.01%     
==========================================
  Files          41       41              
  Lines        3092     3090       -2     
  Branches      668      668              
==========================================
- Hits         3066     3064       -2     
  Misses         14       14              
  Partials       12       12              

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[duriantaco]

will circle back again in a few months just to clean things up (if there's anything)! but by and large this is a really well maintained library. oh and we're users of it too. thanks for this amazing library too 💯