chore: update code maintainers

Signed-off-by: Javier Ribó <elribonazo@gmail.com>

.github/CODEOWNERS

@@ -1,6 +1,6 @@
 # These owners will be the default owners for everything in
 # the repo. Unless a later match takes precedence
-* @petevielhaber @yshyn-iohk @amagyar-iohk @bvoiturier @lohanspies @mkbreuningIOHK @Dale-iohk @elribonazo @essbante-io
+* @identus-maintainers
 
 # Docs:
-*.md @petevielhaber
+*.md @identus-maintainers