Bug#1040230: ruby-cairo: autopkgtest failure with cairo 1.17.8-2

[Jeremy Bícha]

The upstream changelog suggests that this issue would be fixed if
ruby-cairo 1.17.9 or newer is packaged.

Here's a link to the test failure:
https://autopkgtest.ubuntu.com/packages/r/ruby-cairo/mantic/amd64

Thank you,
Jeremy Bícha