Update CODEOWNERS to remove a reviewer (#1979)

Removed @microsoft/debugpy-codereviewers from default owners.

Author: bschnurr

.github/CODEOWNERS

@@ -4,4 +4,4 @@
 # in the repository, i.e. bar/baz will match /bar/baz and /foo/bar/baz.
 
 # The default owners for everything that is not overridden by specific patterns below.
-*   @microsoft/debugpy-CodeReviewers @microsoft/pyrx-admins
+*  @microsoft/pyrx-admins