chore: remove support for Python 3.8

[hussein-awala]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 62.11%. Comparing base (6976b73) to head (7c471a4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
spark_on_k8s/airflow/triggers.py	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #96      +/-   ##
==========================================
- Coverage   62.12%   62.11%   -0.02%     
==========================================
  Files          31       31              
  Lines        1315     1317       +2     
==========================================
+ Hits          817      818       +1     
- Misses        498      499       +1     

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