refactor(python): Avoid unnecessary packaging dependency

[alexander-beedie]

Closes #21221.

Unnecessary import of the packaging module (inside write_delta()).
We can use our own parse_version() here to drop the dependency 👌

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 79.69%. Comparing base (9bcff72) to head (ee76fb3).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
py-polars/polars/dataframe/frame.py	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #21223      +/-   ##
==========================================
- Coverage   79.75%   79.69%   -0.07%     
==========================================
  Files        1593     1593              
  Lines      228119   228118       -1     
  Branches     2600     2600              
==========================================
- Hits       181947   181793     -154     
- Misses      45575    45728     +153     
  Partials      597      597              

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