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

[Debian testing autoremoval watch]

ruby-rbpdf 1.20.1-1 is marked for autoremoval from testing on 2021-11-11

It is affected by these RC bugs:
996363: ruby-rbpdf: FTBFS with ruby3.0: ERROR: Test "ruby3.0" failed: Error: test: Image get image file test(RbpdfHttpTest): NoMethodError: undefined method `shutdown' for nil:NilClass
 https://bugs.debian.org/996363



This mail is generated by:
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