[Fix] Support for newer Python: Remove pickle5 dependency and Update mmcv maximum version

[Wei-Chen-hub]

Pickle5 is not supported under Python version > 3.9, which would raise error in installing MMhuman3d in newer python.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.33%. Comparing base (9431add) to head (ae8646b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #366   +/-   ##
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  Coverage   85.33%   85.33%           
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  Files         211      211           
  Lines       20262    20262           
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  Hits        17290    17290           
  Misses       2972     2972           

Flag	Coverage Δ
unittests	85.33% <100.00%> (ø)

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[justsonghua]

Hello, has this merger been completed?

When I tried to install it in the environment of py3.9, torch2.2.2, and CUDA12.4, pickle5-related errors still appeared

Failed to build pickle5
ERROR: Could not build wheels for pickle5, which is required to install pyproject.toml-based projects

in the last step of the tutorial.

cd mmhuman3d
pip install -v -e .

[johndpope]

merge