www/webtrees: Update to 1.7.20 (security release)
- Submitter becomes maintainer
ChangeLog: https://github.com/fisharebest/webtrees/releases/tag/1.7.20
PR: 267466
MFH: 2022Q4
Security: 140a20e1-8769-11ed-b074-002b67dfc673
(cherry picked from commit 4eac9929c2b7bbfabd0b8a2ae235b73b30230066)