package/ruby: security bump to version 3.0.1

This release includes security fixes:
- CVE-2021-28965: XML round-trip vulnerability in REXML
- CVE-2021-28966: Path traversal in Tempfile on Windows

https://www.ruby-lang.org/en/news/2021/04/05/ruby-3-0-1-released/



Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>