MFH: r551492

devle/ruby-build: Update to 20201005

Add Ruby 2.7.2

This update enables to install Ruby 2.7.2 which includes the fix of
CVE-2020-25613 [1].

[1] https://www.ruby-lang.org/en/news/2020/10/02/ruby-2-7-2-released/

Relnotes: https://github.com/rbenv/ruby-build/releases/tag/v20201005

Approved by: portmgr blanket