Update CODEOWNERS to remove an owner (#185)

Removed `@TrevorKarjanis` from default code owners since he's no longer
a maintainer of this repo.

Author: jattasNI

.github/CODEOWNERS

@@ -4,4 +4,4 @@
 # More info: https://docs.github.com/en/github/creating-cloning-and-archiving-repositories/creating-a-repository-on-github/about-code-owners
 
 # These owners will be the default owners for everything in the repo.
-* @jattasNI @rajsite @TrevorKarjanis
+* @jattasNI @rajsite