[release/2.1] Remove Kevin from CodeOwners (#44158)

Author: dougbu

.github/CODEOWNERS

@@ -1,7 +1,6 @@
 # Users referenced in this file will automatically be requested as reviewers for PRs that modify the given paths.
 # See https://help.github.com/articles/about-code-owners/
 
-*                               @Pilchie
 /.azure/                        @dotnet/aspnet-build
 /.config/                       @dotnet/aspnet-build
 /.github/                       @dotnet/aspnet-build