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

[Debian testing autoremoval watch]

ruby-serialport 1.3.1-1 is marked for autoremoval from testing on 2021-11-11

It is affected by these RC bugs:
996384: ruby-serialport: FTBFS with ruby3.0: ERROR: Test "ruby3.0" failed: <internal:/usr/lib/ruby/vendor_ruby/rubygems/core_ext/kernel_require.rb>:85:in `require': /<<PKGBUILDDIR>>/debian/ruby-serialport/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/3.0.0/serialport.so: undefined symbol: rb_secure - /<<PKGBUILDDIR>>/debian/ruby-serialport/usr/lib/x86_64-linux-gnu/ruby/vendor_ruby/3.0.0/serialport.so (LoadError)
 https://bugs.debian.org/996384



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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