MNT: Apply pyupgrade suggestions

[DimitriPapadopoulos]

No description provided.

[codecov]

Codecov Report

Base: 91.81% // Head: 91.81% // No change to project coverage 👍

Coverage data is based on head (5529d85) compared to base (d33a05a).
Patch coverage: 85.71% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1154   +/-   ##
=======================================
  Coverage   91.81%   91.81%           
=======================================
  Files         101      101           
  Lines       12463    12463           
  Branches     2238     2238           
=======================================
  Hits        11443    11443           
  Misses        693      693           
  Partials      327      327           

Impacted Files	Coverage Δ
nibabel/freesurfer/io.py	94.24% <0.00%> (ø)
nibabel/nifti1.py	92.63% <ø> (ø)
nibabel/nifti2.py	94.59% <ø> (ø)
nibabel/volumeutils.py	93.08% <75.00%> (ø)
nibabel/cifti2/cifti2.py	96.85% <100.00%> (ø)
nibabel/cmdline/ls.py	77.21% <100.00%> (ø)
nibabel/cmdline/parrec2nii.py	90.41% <100.00%> (ø)
nibabel/ecat.py	88.07% <100.00%> (ø)
nibabel/filebasedimages.py	92.05% <100.00%> (ø)
nibabel/gifti/gifti.py	87.78% <100.00%> (ø)
... and 3 more

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[effigies]

All of these look good.