imagemagick jammy/8:6.9.11.60+dfsg-1.3ubuntu0.22.04.5 introduced failing test case in ruby-rmagick build

[Steve Beattie]

The imagemagick security update jammy/8:6.9.11.60+dfsg-1.3ubuntu0.22.04.5 made changes that cause ruby-rmagick's build to fail during it's build tests in the following testcase:

Failures:

  1) Magick::Draw#clip_path works
     Failure/Error: draw.draw(canvas)

     Magick::ImageMagickError:
       unable to open image `7': No such file or directory @ error/blob.c/OpenBlob/2924
     ./spec/rmagick/draw/clip_path_spec.rb:29:in `draw'
     ./spec/rmagick/draw/clip_path_spec.rb:29:in `block (2 levels) in <top (required)>'