Make path_matches? private as it's not public

ee/lib/gitlab/code_owners/file.rb

@@ -145,6 +145,8 @@ def normalize_pattern(pattern)
         pattern
       end
 
+      private
+
       def path_matches?(pattern, path)
         # `FNM_DOTMATCH` makes sure we also match files starting with a `.`
         # `FNM_PATHNAME` makes sure ** matches path separators