Use platformdirs instead of appdirs

[gaborbernat]

Signed-off-by: Bernát Gábor [email protected]

[gaborbernat]

Blocked on #2143

[codecov]

Codecov Report

Merging #2142 (be9b09a) into main (ce6efc8) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2142   +/-   ##
=======================================
  Coverage   93.66%   93.66%           
=======================================
  Files          88       88           
  Lines        4358     4358           
=======================================
  Hits         4082     4082           
  Misses        276      276           

Flag	Coverage Δ
tests	93.66% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/virtualenv/app_data/__init__.py	94.11% <100.00%> (ø)
src/virtualenv/config/ini.py	89.83% <100.00%> (ø)

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