fix github username for Suzanna Lewis (#2737)

Author: nlharris

_data/alumni.yml

@@ -32,7 +32,7 @@ members:
   note: OBO Industry Liaison
   orcid: 0000-0002-0643-3144
   wikidata: Q54303148
-- github: suzialeksander
+- github: selewis
   link: https://github.com/selewis
   name: Suzanna Lewis
   orcid: 0000-0002-8343-612X