Fix code style

[astrofrog]

This must have been failing because a new version of black

[codecov]

Codecov Report

Merging #340 (aee57c8) into main (2c21822) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #340   +/-   ##
=======================================
  Coverage   92.02%   92.02%           
=======================================
  Files          24       24           
  Lines         803      803           
=======================================
  Hits          739      739           
  Misses         64       64           

Impacted Files	Coverage Δ
reproject/array_utils.py	100.00% <ø> (ø)
reproject/mosaicking/background.py	94.87% <ø> (ø)
reproject/mosaicking/coadd.py	92.42% <ø> (ø)
reproject/mosaicking/subset_array.py	97.72% <ø> (ø)
reproject/mosaicking/wcs_helpers.py	100.00% <ø> (ø)
reproject/spherical_intersect/core.py	98.07% <ø> (ø)
reproject/spherical_intersect/setup_package.py	29.41% <ø> (ø)
reproject/utils.py	84.10% <ø> (ø)
reproject/wcs_utils.py	95.83% <ø> (ø)

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