Add pyupgrade as pre-commit hook

[maresb]

This builds on #1483.

Pyupgrade upgrades idiomatic Python code to a particular minimum version. Thus it does things like replacing .format with f-strings, and updating some imports. It gives a substantial increase in code quality IMO.

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[codecov]

Codecov Report

Merging #1484 (ccca397) into main (1da48b5) will increase coverage by 0.03%.
The diff coverage is 98.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1484      +/-   ##
==========================================
+ Coverage   75.02%   75.06%   +0.03%     
==========================================
  Files         194      194              
  Lines       50102    50091      -11     
  Branches    12096    12096              
==========================================
+ Hits        37589    37600      +11     
+ Misses      10189    10170      -19     
+ Partials     2324     2321       -3     

Impacted Files	Coverage Δ
aesara/configparser.py	84.94% <ø> (ø)
aesara/gradient.py	76.99% <ø> (-0.04%)	⬇️
aesara/graph/basic.py	88.24% <ø> (ø)
aesara/graph/fg.py	88.98% <ø> (-0.04%)	⬇️
aesara/graph/utils.py	64.84% <ø> (ø)
aesara/link/c/basic.py	87.14% <ø> (ø)
aesara/link/c/params_type.py	80.41% <ø> (ø)
aesara/link/c/type.py	75.98% <ø> (ø)
aesara/link/numba/dispatch/basic.py	92.25% <ø> (ø)
aesara/scalar/basic.py	79.17% <ø> (ø)
... and 26 more

... and 8 files with indirect coverage changes