Improve typing 03 25

[bashtage]

No description provided.

To fix the problem, we need to remove the redundant import numba statement. This will eliminate the unnecessary import and make the code cleaner. The from numba import jit statement within the try block will handle the import of numba if it is available, and the HAS_NUMBA variable will be set accordingly.

[codecov]

Codecov Report

Attention: Patch coverage is 98.61111% with 4 lines in your changes missing coverage. Please review.

Project coverage is 99.30%. Comparing base (d62f9d4) to head (d329ff7).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
arch/univariate/volatility.py	96.63%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #771      +/-   ##
==========================================
- Coverage   99.32%   99.30%   -0.03%     
==========================================
  Files          75       75              
  Lines       15722    15769      +47     
  Branches     1284     1293       +9     
==========================================
+ Hits        15616    15659      +43     
- Misses         77       79       +2     
- Partials       29       31       +2     

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