Issue #2868357 by sahilsharma011: Use an indent of 4 spaces for composer.lock

.editorconfig

@@ -13,5 +13,5 @@ charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
 
-[composer.json]
+[composer.{json,lock}]
 indent_size = 4