build: drop python 3.7, support 3.11

[tlambert03]

No description provided.

[codecov]

Codecov Report

Merging #482 (72e1491) into main (23372b0) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #482      +/-   ##
==========================================
- Coverage   89.52%   89.51%   -0.01%     
==========================================
  Files          31       31              
  Lines        4000     3997       -3     
==========================================
- Hits         3581     3578       -3     
  Misses        419      419              

Impacted Files	Coverage Δ
magicgui/widgets/_table.py	96.30% <ø> (-0.01%)	⬇️
magicgui/type_map.py	96.56% <100.00%> (ø)
magicgui/widgets/_concrete.py	86.81% <100.00%> (ø)
magicgui/widgets/_image.py	86.15% <100.00%> (-0.21%)	⬇️
magicgui/widgets/_protocols.py	100.00% <100.00%> (ø)

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