community/ruby-rmagick: upgrade to 4.2.6

Merged Patrycja Rosa requested to merge ptrcnull/aports:ruby-rmagick into master

- Guard against an empty rpath (#1333)
- Remove test_files to reduce gem package size (#1338)
- Added codespaces configurations (#1341)
- Update ImageMagick to 6.9.12-56 and 7.1.0-41 (#1323)
- Call GetImageDistortion instead of IsImagesEqual to fix

builds with imagemagick 7 instead of 6

one test failing, but it's been failing before, so i guess it's fine

Edited by Patrycja Rosa

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