Use IntEnum for ccflow.Enum with csp 0.19 or newer

[timkpaine]

Also remove ruff noqa

[github-actions]

Test Results

    1 files  ±0      1 suites  ±0   1m 42s ⏱️ - 1m 14s
1 462 tests +1  1 460 ✅ +1  2 💤 ±0  0 ❌ ±0 
1 468 runs  +1  1 466 ✅ +1  2 💤 ±0  0 ❌ ±0 

Results for commit cedfc10. ± Comparison against base commit 70df911.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

❌ Patch coverage is 91.04478% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.76%. Comparing base (70df911) to head (cedfc10).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
ccflow/enums.py	85.71%	3 Missing and 2 partials ⚠️
ccflow/tests/enums/test_enums.py	95.23%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #280      +/-   ##
==========================================
- Coverage   93.79%   93.76%   -0.03%     
==========================================
  Files         190      190              
  Lines       21552    21597      +45     
  Branches     1413     1415       +2     
==========================================
+ Hits        20215    20251      +36     
- Misses       1062     1068       +6     
- Partials      275      278       +3     

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