run pyupgrade and optimize imports in pycharm

[devPalacio]

Checklist

General Contributing

• Have you read the Code of Conduct and signed the CLA?

Is This a Code Change?

• Non-code related change (markdown/git settings etc)
• Code Change
• Example/Test Code Change

Validation

• Have you ran tox?
• Do the tests pass?

[codecov]

Codecov Report

Merging #312 (d274aa9) into main (02feff3) will decrease coverage by 0.02%.
The diff coverage is 66.50%.

❗ Current head d274aa9 differs from pull request most recent head a6c7fcb. Consider uploading reports for the commit a6c7fcb to get more accurate results

@@            Coverage Diff             @@
##             main     #312      +/-   ##
==========================================
- Coverage   51.94%   51.93%   -0.02%     
==========================================
  Files          37       37              
  Lines        8464     8415      -49     
  Branches     1811     1807       -4     
==========================================
- Hits         4397     4370      -27     
+ Misses       3750     3729      -21     
+ Partials      317      316       -1     

Flag	Coverage Δ
unit	51.93% <66.50%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
stone/backends/helpers.py	86.36% <ø> (-0.60%)	⬇️
stone/backends/js_types.py	0.00% <0.00%> (ø)
stone/backends/obj_c.py	0.00% <0.00%> (ø)
stone/backends/obj_c_client.py	0.00% <0.00%> (ø)
stone/backends/obj_c_helpers.py	0.00% <ø> (ø)
stone/backends/obj_c_types.py	0.00% <0.00%> (ø)
stone/backends/python_client.py	46.26% <ø> (-0.20%)	⬇️
stone/backends/python_types.py	35.86% <0.00%> (-0.12%)	⬇️
stone/backends/swift.py	0.00% <0.00%> (ø)
stone/backends/swift_client.py	0.00% <0.00%> (ø)
... and 24 more

[aaronsky]

here's another one