Add @mjmahone to 2023 Jul Primary

Author: mjmahone

agendas/2023/07-Jul/06-wg-primary.md

@@ -104,6 +104,7 @@ hold additional secondary meetings later in the month.
 | Lee Byron (Host) | @leebyron     | GraphQL Foundation | San Francisco, CA, US |
 | Anthony Miller   | @AnthonyMDev  | Apollo GraphQL     | Las Vegas, NV, US     |
 | Benjie Gillam    | @benjie       | Graphile           | Chandler's Ford, UK   |
+| Matt Mahoney     | @mjmahone     | Meta               | New York, NY, US      |
 | Michael Staib    | @michaelstaib | ChilliCream        | Zurich, CH            |
 | Rob Richard      | @robrichard   | 1stDibs            | Jersey City, NJ, US   |
 | Yaacov Rydzinski | @robrichard   | Individual         | Neve Daniel, IL       |