Introduce pyupgrade to remove py2 and < py3.6 related code

[thatlittleboy]

Overview

Description of the changes proposed in this pull request:

• Added UP ruff checks during pre-commit and set minimum python version in setup.py. Note: I ran both asottile's pyupgrade and ruff's UP rule locally just to make sure we cover our bases.
• Ran ruff --fix. This removed __future__ imports and switched to using f-string's for the most part. I visually inspected all the fixes and everything looks fine.
• Removed the try-except block for urrlib.request, this module is present in stdlib since py3.
• I also removed pylint and flake8 related config. We don't use these tools, and should be translated to corresponding ruff config, if necessary.

Checklist

• All pre-commit checks pass.
• Unit tests added (if fixing a bug or adding a new feature)
• Added entry to CHANGELOG.md (if changes will affect users)

[codecov]

Codecov Report

Merging #2986 (d105839) into master (c24ff9a) will decrease coverage by 0.03%.
The diff coverage is 61.90%.

@@            Coverage Diff             @@
##           master    #2986      +/-   ##
==========================================
- Coverage   54.75%   54.72%   -0.03%     
==========================================
  Files          90       90              
  Lines       12904    12887      -17     
==========================================
- Hits         7066     7053      -13     
+ Misses       5838     5834       -4     

Impacted Files	Coverage Δ
shap/benchmark/experiments.py	0.00% <0.00%> (ø)
shap/benchmark/framework.py	0.00% <0.00%> (ø)
shap/benchmark/models.py	0.00% <0.00%> (ø)
shap/benchmark/plots.py	0.00% <0.00%> (ø)
shap/explainers/_additive.py	28.20% <0.00%> (ø)
shap/explainers/_deep/deep_pytorch.py	91.33% <0.00%> (ø)
shap/plots/_beeswarm.py	77.71% <ø> (-0.05%)	⬇️
shap/plots/_benchmark.py	4.80% <0.00%> (ø)
shap/plots/_decision.py	50.20% <0.00%> (-0.21%)	⬇️
shap/plots/_scatter.py	26.45% <ø> (-0.17%)	⬇️
... and 13 more

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[connortann]

LGTM