mail/sympa: Update WWW
The website for the community of Sympa have moved to the
new domain "sympa.community".
PR: 297888
Approved by: Geoffroy Desvernay <dgeo@centrale-med.fr>
(maintainer timeout, 2+ weeks)
Approved by: osa, vvd (Mentors, implicit)
(cherry picked from commit b5beeff440fe0d7c0ec15d72e30bcefb6b30343f)