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

[Debian testing autoremoval watch]

ruby-airbrussh 1.4.0-2 is marked for autoremoval from testing on 2022-03-29

It (build-)depends on packages with these RC bugs:
1005423: ruby-sshkit: FTBFS: ERROR: Test "ruby2.7" failed: /<<PKGBUILDDIR>>/test/unit/runners/test_parallel.rb:9:in `block in test_wraps_ruby_standard_error_in_execute_error': oh no! (RuntimeError)
 https://bugs.debian.org/1005423



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