Fix compatibility with IPython 9

[flying-sheep]

IPython removed the IPython.display.set_matplotlib_formats API we call in the settings

• Fixes Deprecated use of IPython.display.set_matplotlib_formats #1842
• Release notes included

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 75.52%. Comparing base (672675d) to head (1e6614a).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/scanpy/_settings.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3499   +/-   ##
=======================================
  Coverage   75.52%   75.52%           
=======================================
  Files         113      113           
  Lines       13229    13229           
=======================================
  Hits         9991     9991           
  Misses       3238     3238           

Files with missing lines	Coverage Δ
src/scanpy/_settings.py	88.75% <0.00%> (ø)

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