[DRE-maint] ruby-mmap2 is marked for autoremoval from testing

[Debian testing autoremoval watch]

ruby-mmap2 2.2.7-1 is marked for autoremoval from testing on 2021-11-10

It is affected by these RC bugs:
996322: ruby-mmap2: FTBFS with ruby3.0: ERROR: Test "ruby3.0" failed: <internal:/usr/lib/ruby/vendor_ruby/rubygems/core_ext/kernel_require.rb>:85:in `require': cannot load such file -- mmap (LoadError)
 https://bugs.debian.org/996322



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https://salsa.debian.org/release-team/release-tools/-/blob/master/mailer/mail_autoremovals.pl

Autoremoval data is generated by:
https://salsa.debian.org/qa/udd/-/blob/master/udd/testing_autoremovals_gatherer.pl