CCM-8855: update CODEOWNERS

Author: m-houston

.github/CODEOWNERS

@@ -1,17 +1,13 @@
 # NHS Notify Code Owners
 
-# Notify default owners
-* @rossbugginsnhs @m-houston @aidenvaines-bjss @timireland
+*                                                                      @NHSDigital/nhs-notify-supplier-api
+/.github/                                                              @NHSDigital/nhs-notify-admins
+*.code-workspace                                                       @NHSDigital/nhs-notify-admins
 
 # Codeowners must be final check
 /.github/CODEOWNERS @NHSDigital/nhs-notify-code-owners
 /CODEOWNERS @NHSDigital/nhs-notify-code-owners
 
-
-# Each NHS Notify repository should have clear code owners set.
-# Do not use GitHub team names, instead use the GitHub usernames
-# of the people who are responsible for the code maintenance.
-
 # This is a comment.
 # Each line is a file pattern followed by one or more owners.