refactor: use pathlib

[sigma67]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 95.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.19%. Comparing base (7d8a756) to head (0562503).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
ytmusicapi/auth/oauth/token.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #654      +/-   ##
==========================================
+ Coverage   95.15%   95.19%   +0.03%     
==========================================
  Files          38       38              
  Lines        2293     2290       -3     
==========================================
- Hits         2182     2180       -2     
+ Misses        111      110       -1     

Flag	Coverage Δ
unittests	95.19% <95.00%> (+0.03%)	⬆️

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