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

[Debian testing autoremoval watch]

ruby-browser 2.5.3-1 is marked for autoremoval from testing on 2020-03-23

It is affected by these RC bugs:
952044: ruby-browser: FTBFS: ERROR: Test "ruby2.7" failed: Invalid gemspec in [browser.gemspec]: No such file or directory - git