[DRE-maint] ruby-protected-attributes is marked for autoremoval from testing

[Debian testing autoremoval watch]

ruby-protected-attributes 1.1.4-2 is marked for autoremoval from testing on 2019-02-17

It is affected by these RC bugs:
918260: ruby-protected-attributes: Depends: ruby-activemodel (< 2:5.0) but 2:5.2.0+dfsg-2 is to be installed