Remove aeasara from requirements

[dweindl]

https://github.com/aesara-devs/aesara is no longer maintained, and pymc does not require aesara.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.63%. Comparing base (6beb8f5) to head (7ec58a2).
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Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1595      +/-   ##
===========================================
+ Coverage    83.61%   83.63%   +0.02%     
===========================================
  Files          163      163              
  Lines        14018    14018              
===========================================
+ Hits         11721    11724       +3     
+ Misses        2297     2294       -3     

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