Rebuild the CI image to get a newer grcov
Rebuild the CI image to get a newer grcov

It's getting division by zero in 0.8.4, but there are a couple of
bugfixes for that in grcov 0.8.5.  Let's see if this update the grcov
version.

GNOME/librsvg,GNOME/librsvg,GNOME/librsvg,GNOME/librsvg