chore(style): Run pyupgrade --py311-plus to modernize idioms

[effigies]

pyupgrade is a tool that automatically adopts newer syntax when available without changing the results. The semantics might change slightly (e.g. f-strings have different bytecode than the equivalent string.format(...)) but it's very good about not breaking things, so it's pretty safe.

[codecov]

Codecov Report

Attention: Patch coverage is 85.29412% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 43.42%. Comparing base (cd5c1e0) to head (3f133d1).
Report is 2 commits behind head on master.

Files	Patch %	Lines
services/datalad/datalad_service/handlers/git.py	60.00%	2 Missing ⚠️
services/datalad/datalad_service/common/annex.py	80.00%	1 Missing ⚠️
services/datalad/datalad_service/handlers/files.py	50.00%	1 Missing ⚠️
services/datalad/datalad_service/tasks/audit.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3051      +/-   ##
==========================================
+ Coverage   42.48%   43.42%   +0.94%     
==========================================
  Files         601      601              
  Lines       37971    37971              
  Branches     1113     1147      +34     
==========================================
+ Hits        16131    16490     +359     
+ Misses      21624    21274     -350     
+ Partials      216      207       -9     

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