Bump pinned black version

[bwohlberg]

Bump pinned black version to address psf/black#2964.

[codecov]

Codecov Report

Merging #268 (1e51699) into main (70be677) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #268   +/-   ##
=======================================
  Coverage   93.83%   93.83%           
=======================================
  Files          50       50           
  Lines        3681     3681           
=======================================
  Hits         3454     3454           
  Misses        227      227           

Flag	Coverage Δ
unittests	93.83% <100.00%> (ø)

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Impacted Files	Coverage Δ
scico/blockarray.py	91.18% <100.00%> (ø)
scico/examples.py	95.87% <100.00%> (ø)
scico/functional/_norm.py	100.00% <100.00%> (ø)
scico/linop/_linop.py	98.07% <100.00%> (ø)
scico/linop/optics.py	95.68% <100.00%> (ø)
scico/loss.py	94.21% <100.00%> (ø)
scico/metric.py	100.00% <100.00%> (ø)
scico/optimize/pgm.py	96.46% <100.00%> (ø)

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