Replace inactive code owners with myself

Signed-off-by: Marcin Owsiany <porridge@redhat.com>

.github/CODEOWNERS

@@ -5,7 +5,7 @@
 # the repo. Unless a later match takes precedence,
 # @global-owner1 and @global-owner2 will be requested for
 # review when someone opens a pull request.
-*       @kensipe @asekretenko @kaiwalyajoshi @iblancasa
+*       @kensipe @porridge
 
 # In this example, @doctocat owns any files in the build/logs
 # directory at the root of the repository and any of its