Update CODEOWNERS (#1049)

Add contractors to CODEOWNERS

Author: pransh15

.github/CODEOWNERS

@@ -5,7 +5,7 @@
 # See: https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
 # ----------------------------------------------------------------------------
 
-* @mdn/content-team
+* @mdn/content-team @mdn/contractors
 
 /.github/workflows/ @mdn/engineering
 /.github/CODEOWNERS @mdn/content-team @mdn/engineering