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

[Debian testing autoremoval watch]

ruby-rack-mount 0.8.3-3 is marked for autoremoval from testing on 2022-03-01

It is affected by these RC bugs:
1004654: ruby-rack-mount: FTBFS with ruby-rack 2.2.3 "http://josh.backpackit.com/host">(UTF-8) expected but was <"http://example.org/host">(ASCII-8BIT)
 https://bugs.debian.org/1004654



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