lang/ruby27: Update to 2.7.5

ReleaseNotes: https://www.ruby-lang.org/en/news/2021/11/24/ruby-2-7-5-released/
PR: 260030
Exp-run by: antoine
Approved by: maintainer timeout (> 2 weeks)
Security: CVE-2021-41816
Security: CVE-2021-41817
Security: CVE-2021-41819
MFH: 2021Q4