[DRE-maint] ruby-proc-to-ast is marked for autoremoval from testing

[Debian testing autoremoval watch]

ruby-proc-to-ast 0.1.0-2 is marked for autoremoval from testing on 2021-11-25

It (build-)depends on packages with these RC bugs:
996297: ruby-ice-nine: FTBFS with ruby3.0: ERROR: Test "ruby3.0" failed:       Failure/Error: expect(subject.end).to be_frozen
 https://bugs.debian.org/996297



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