chore: update fixtures (#273)

Author: ota-meshi

test/fixtures/ast/define-slots01/ast.json

@@ -481,7 +481,7 @@
             "value": "{"
         },
         {
-            "type": "Keyword",
+            "type": "Identifier",
             "loc": {
                 "end": {
                     "line": 3,