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

[Debian testing autoremoval watch]

ruby-gsl 2.1.0.3+dfsg1-3 is marked for autoremoval from testing on 2021-11-25

It is affected by these RC bugs:
996237: ruby-gsl: FTBFS with ruby3.0: include/rb_gsl_common.h:29:1: error: unknown type name ‘EXTERN’
 https://bugs.debian.org/996237



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