update my org affiliation on core team page

Author: SethTisue

_data/scala-core.yml

@@ -81,4 +81,4 @@
   github: SethTisue
   mastodon: https://fosstodon.org/@SethTisue
   linkedin: https://www.linkedin.com/in/sethtisue/
-  org: Akka
+  org: independent