added JSON modules and import attributes

test262.conf

@@ -116,9 +116,7 @@ for-of
 generators
 globalThis
 hashbang
-host-gc-required=skip
-import-assertions=skip
-import-attributes=skip
+import-attributes
 import-defer=skip
 import.meta
 Int16Array
@@ -144,7 +142,7 @@ Intl.Segmenter=skip
 IsHTMLDDA
 iterator-helpers=skip
 iterator-sequencing=skip
-json-modules=skip
+json-modules
 json-parse-with-source=skip
 json-superset
 legacy-regexp=skip