[DRE-maint] ruby-fast-gettext is marked for autoremoval from testing

[Debian testing autoremoval watch]

ruby-fast-gettext 1.3.0-1 is marked for autoremoval from testing on 2019-02-25

It (build-)depends on packages with these RC bugs:
918260: ruby-protected-attributes: Depends: ruby-activemodel (< 2:5.0) but 2:5.2.0+dfsg-2 is to be installed