docs: Update Wojciech's Discord (#1706)

Author: tgodzik

_data/scala-core.yml

@@ -67,7 +67,7 @@
   description: Scala Native Representative, Release Officer, Community Build Maintainer 
   image: /scala-core/wojciech-mazur.jpg
   city: Kraków, Poland
-  discord: tgodzik
+  discord: wmazur
   github: WojciechMazur
   twitter: WojciechM_dev
   linkedin: https://www.linkedin.com/in/wojciech-mazur-3970a8121/