remove upper bound on anyio

[minrk]

upper-bound pin added during dependency sorting in #675, for no reason I can see. Perhaps by accident, since there is no anyio 4, and there's no reason to suspect it would break our use.

It's generally desirable to avoid upper bounds in Python because they tend to create far more problems than they solve (in packages, self-contained applications have different needs).

Upper bounds should generally only be added in packages:

• if a known incompatibility has been identified, and
• with an immediate issue/pr to revert the pin flagging that it's a pressing issue to fix, because upper bounds themselves are a problem that needs fixing if it excludes the latest version of something.

[codecov]

Codecov Report

Base: 79.78% // Head: 80.41% // Increases project coverage by +0.62% 🎉

Coverage data is based on head (d3e06a5) compared to base (beb0d45).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1192      +/-   ##
==========================================
+ Coverage   79.78%   80.41%   +0.62%     
==========================================
  Files          68       68              
  Lines        8117     8117              
  Branches     1584     1584              
==========================================
+ Hits         6476     6527      +51     
+ Misses       1207     1176      -31     
+ Partials      434      414      -20     

Impacted Files	Coverage Δ
jupyter_server/gateway/managers.py	83.60% <0.00%> (+0.23%)	⬆️
jupyter_server/base/handlers.py	78.82% <0.00%> (+0.39%)	⬆️
jupyter_server/services/contents/fileio.py	90.05% <0.00%> (+1.04%)	⬆️
jupyter_server/serverapp.py	80.03% <0.00%> (+1.41%)	⬆️
jupyter_server/extension/handler.py	69.23% <0.00%> (+1.53%)	⬆️
jupyter_server/nbconvert/handlers.py	79.09% <0.00%> (+1.81%)	⬆️
jupyter_server/services/contents/filemanager.py	75.75% <0.00%> (+1.87%)	⬆️
...ter_server/services/kernels/connection/channels.py	61.72% <0.00%> (+1.99%)	⬆️
jupyter_server/utils.py	85.46% <0.00%> (+4.65%)	⬆️

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[blink1073]

Thanks!

[SylvainCorlay]

A reason to think it will break is the major version bump!