Add mjmahone to Jan 2024 Primary

Author: mjmahone

agendas/2024/01-Jan/04-wg-primary.md

@@ -104,7 +104,8 @@ hold additional secondary meetings later in the month.
 | Lee Byron (Host) | @leebyron     | GraphQL Foundation | San Francisco, CA, US |
 | Benjie Gillam    | @benjie       | Graphile           | Chandler's Ford, UK   |
 | Martin Bonnin    | @martinbonnin | Apollo             | Paris, FR             |
-| Jeff Auriemma    | @bignimbus    | Apollo             | Monroe, CT, US
+| Jeff Auriemma    | @bignimbus    | Apollo             | Monroe, CT, US        |
+| Matt Mahoney     | @mjmahone     | Meta               | New York, NY, US      |
 
 
 ## Agenda