feat: use libCST's native parser

[browniebroke]

No description provided.

[sourcery-ai]

Sourcery Code Quality Report

✅  Merging this PR will increase code quality in the affected files by 0.17%.

Quality metrics	Before	After	Change
Complexity	1.51 ⭐	1.49 ⭐	-0.02 👍
Method Length	38.50 ⭐	37.95 ⭐	-0.55 👍
Working memory	6.17 ⭐	6.14 ⭐	-0.03 👍
Quality	83.77% ⭐	83.94% ⭐	0.17% 👍

Other metrics	Before	After	Change
Lines	397	404	7

Changed files	Quality Before	Quality After	Quality Change
src/django_codemod/cli.py	77.65% ⭐	77.69% ⭐	0.04% 👍
tests/test_cli.py	90.17% ⭐	90.39% ⭐	0.22% 👍

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Working Memory	Quality	Recommendation
src/django_codemod/cli.py	run	4 ⭐	167 😞	18 ⛔	46.38% 😞	Try splitting into smaller methods. Extract out complex expressions
src/django_codemod/cli.py	VersionParamType._parse_unsafe	1 ⭐	57 ⭐	10 😞	74.38% 🙂	Extract out complex expressions

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[codecov]

Codecov Report

Merging #574 (934a382) into main (a26184b) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #574   +/-   ##
=======================================
  Coverage   98.63%   98.64%           
=======================================
  Files          30       30           
  Lines        1028     1030    +2     
  Branches      196      196           
=======================================
+ Hits         1014     1016    +2     
  Partials       14       14           

Impacted Files	Coverage Δ
src/django_codemod/cli.py	99.18% <100.00%> (+0.01%)	⬆️

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