ruby: 2.7.1 -> 2.7.3

ruby: 2.7.1 -> 2.7.3

This release includes security fixes.

CVE-2021-28965: XML round-trip vulnerability in REXML
CVE-2021-28966: Path traversal in Tempfile on Windows

CVE-2020-25613 fixed in 2.7.2, do drop the patch

release notes for 2.7.2 and 2.7.3
https://www.ruby-lang.org/en/news/2020/10/02/ruby-2-7-2-released/
https://www.ruby-lang.org/en/news/2021/04/05/ruby-2-7-3-released/

Signed-off-by: Lee Chee Yang <chee.yang.lee@intel.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>