biology/phyml: update to 3.3.20200621

From ChangeLog: https://github.com/stephaneguindon/phyml/releases/tag/v3.3.20200621

This release fixes a few minor bugs (see recent commits). The manual also gives
extra XML configuration information in order to apply fancy substitution models
(e.g., CAT-like) on single- or multiple-gene data sets

Reported by: portscout