Update minimal and recommended Perl versions
Source for the minimal version: https://wiki.koha-community.org/wiki/Development_IRC_meeting_1_July_2020
Source for the recommended version: etc/notes.tt
already listed it
About the >=
: it's a proposal to avoid implying that 5.24 precisely is recommended. There is no need to, right?
Are templates/release_notes_tmpl.tt
and templates/release_notes_tmpl_html.tt
still used?