[DRE-maint] Bug#1093786: src:ruby-vips: fails to migrate to testing for too long

[Lucas Nussbaum]

This is still a problem today.

> Issues preventing migration:
> ∙ Updating ruby-vips would introduce bugs in testing: #1088648, #1098623, #1102179
> ∙ autopkgtest for ruby-image-processing/1.14.0-2: amd64: Pass, arm64: Pass, armel: Regression or new test ♻ (reference ♻), armhf: Regression or new test ♻ (reference ♻), i386: Pass, ppc64el: Regression or new test ♻ (reference ♻), riscv64: Regression or new test ♻ (reference ♻), s390x: Regression or new test ♻ (reference ♻)
> ∙ autopkgtest for ruby-vips/2.2.2-1: amd64: Regression or new test ♻ (reference ♻), arm64: Pass, armel: Regression or new test ♻ (reference ♻), armhf: Pass, i386: Pass, ppc64el: Pass, riscv64: Regression or new test ♻ (reference ♻), s390x: Pass