Bug#984522: The ruby-gnome autopkgtests are failing with 2.31

[Sebastien Bacher]

Package: webkit2gtk
Version: 2.31.90-1

The ruby-gnome autopkgtests started failing with the new webkit2gtk serie
https://autopkgtest.ubuntu.com/packages/r/ruby-gnome/hirsute/amd64

One log example
https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-hirsute/hirsute/amd64/r/ruby-gnome/20210301_162450_69d15@/log.gz