Add Micaela and Yuxuan to external liaison team (#429)

In the latest round of team reviews, I proposed adding @micaela-matta and @yuxuanzhuang to the External Liaison team based on their past contributions to securing sponsorships for events (MM) and participation in the NF project summit and collabs with other projects (e.g., Molecular Nodes) (YZ)

Author: jennaswa

_data/team/roles/external_liaison.yml

@@ -6,5 +6,7 @@ tasks:
 
 current_members:
   - "[Irfan Alibay](https://github.com/IAlibay)"
-  - "[Oliver Beckstein](https://github.com/orbeckst)"
   - "[Jenna Swarthout Goddard](https://github.com/jennaswa)"
+  - "[Micaela Matta](https://github.com/micaela-matta)"
+  - "[Oliver Beckstein](https://github.com/orbeckst)"
+  - "[Yuxuan Zhuang](https://github.com/yuxuanzhuang)"