Remove support for Python 3.8

[fealho]

CU-86b75xfwy, Resolve #469.

[sdv-team]

Task linked: CU-86b75xfwy CTGAN - Remove support for Python 3.8 #469

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.20%. Comparing base (f9de900) to head (eebd284).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #470   +/-   ##
=======================================
  Coverage   86.20%   86.20%           
=======================================
  Files          12       12           
  Lines         812      812           
=======================================
  Hits          700      700           
  Misses        112      112           

Flag	Coverage Δ
integration	85.59% <ø> (ø)
unit	69.70% <ø> (ø)

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