Log Message:
lang/ruby27-base: update to 2.7.4

Ruby 2.7.4 has been released.

This release includes security fixes.  Please check the topics below
for details.

* CVE-2021-31810: Trusting FTP PASV responses vulnerability in Net::FTP
* CVE-2021-32066: A StartTLS stripping vulnerability in Net::IMAP
* CVE-2021-31799: A command injection vulnerability in RDoc

See the commit logs for details:
<https://github.com/ruby/ruby/compare/v2_7_3...v2_7_4>.