[DRE-maint] ruby-puppetlabs-spec-helper is marked for autoremoval from testing

[Debian testing autoremoval watch]

ruby-puppetlabs-spec-helper 2.6.2-1 is marked for autoremoval from testing on 2020-03-23

It is affected by these RC bugs:
952070: ruby-puppetlabs-spec-helper: FTBFS: ERROR: Test "ruby2.5" failed: Failure/Error: Puppet::Parser::Functions.expects(:function).with('my_func').returns(false)