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

[Debian testing autoremoval watch]

ruby-slowpoke 0.3.2-2 is marked for autoremoval from testing on 2021-12-25

It (build-)depends on packages with these RC bugs:
996352: ruby-rack-timeout: FTBFS with ruby3.0: ERROR: Test "ruby3.0" failed: Error: test_zero_wait_timeout(EnvSettingsTest): ArgumentError: wrong number of arguments (given 2, expected 1)
 https://bugs.debian.org/996352



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