ci(CODEOWNERS): let @mdn-bot approve npm updates

Author: caugner

.github/CODEOWNERS

@@ -9,4 +9,6 @@
 
 /.github/workflows/ @mdn/engineering
 /.github/CODEOWNERS @mdn/engineering
-/SECURITY.md @mdn/engineering
+/SECURITY.md        @mdn/engineering
+/package.json       @mdn/content-team @mdn-bot
+/package-lock.json  @mdn/content-team @mdn-bot