converters/bibtexconv: Update 2.2.2 => 2.2.4

Changelog:
https://github.com/dreibh/bibtexconv/blob/bibtexconv-2.2.4/ChangeLog

Commit log:
https://github.com/dreibh/bibtexconv/compare/bibtexconv-2.2.2...bibtexconv-2.2.4

PR: 297193
Reported by: Thomas Dreibholz <thomas.dreibholz@gmail.com> (maintainer)
Approved by: osa, vvd (Mentors, implicit)