MAINT: fix formatting raised by new flake8 version

[bsipocz]

This should fix the new errors we see due to the new flake8 release.
All of them seem to be reasonable, so we should just go ahead with the update.

[codecov]

Codecov Report

Merging #468 (a5075ff) into main (4bb146a) will not change coverage.
The diff coverage is 66.66%.

@@           Coverage Diff           @@
##             main     #468   +/-   ##
=======================================
  Coverage   79.98%   79.98%           
=======================================
  Files          52       52           
  Lines        6036     6036           
=======================================
  Hits         4828     4828           
  Misses       1208     1208           

Files Changed	Coverage Δ
pyvo/dal/sia.py	62.19% <0.00%> (ø)
pyvo/dal/ssa.py	53.53% <0.00%> (ø)
pyvo/dal/mimetype.py	82.60% <100.00%> (ø)
pyvo/dal/query.py	84.81% <100.00%> (ø)
pyvo/dal/sia2.py	76.96% <100.00%> (ø)
pyvo/io/vosi/tests/test_capabilities.py	100.00% <100.00%> (ø)
pyvo/io/vosi/tests/test_tables.py	99.11% <100.00%> (ø)

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[msdemlei]

Looks good to me -- thanks!

[tomdonaldson]

Thanks for patching this up!