FIX: Validate ExpiredDeprecationErrors

[effigies]

• Checks for ExpiredDeprecationError for:
  • ArrayProxy.header
  • SpatialImage.get_shape()
  • SpatialImage.to_files()
  • SpatialImage.to_filespec()
  • SpatialImage.filespec_to_files()
  • SpatialImage.from_files()
  • MincImage
  • MincFile
  • volumeutils.can_cast
  • volumeutils.calculate_scale
  • volumeutils.scale_min_max

Also makes a copy of volumeutils.calculate_scale in the tests, as it's used to validate other methods.

Fixes #854.

[codecov]

Codecov Report

Merging #857 into maint/3.0.x will decrease coverage by 0.39%.
The diff coverage is 100%.

@@              Coverage Diff               @@
##           maint/3.0.x     #857     +/-   ##
==============================================
- Coverage        90.09%   89.69%   -0.4%     
==============================================
  Files               96       96             
  Lines            12416    12422      +6     
  Branches          2186     2187      +1     
==============================================
- Hits             11186    11142     -44     
- Misses             881      935     +54     
+ Partials           349      345      -4

Impacted Files	Coverage Δ
nibabel/volumeutils.py	84.13% <ø> (-8.52%)	⬇️
nibabel/pkg_info.py	84.61% <100%> (+2.79%)	⬆️
nibabel/filebasedimages.py	85.8% <0%> (-2.59%)	⬇️
nibabel/dataobj_images.py	94.02% <0%> (-1.5%)	⬇️
nibabel/arrayproxy.py	99.25% <0%> (-0.75%)	⬇️

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[effigies]

Failed test to be resolved in #858.