chore(deps): upgrade GraphQL (#1541)

postgraphiql/yarn.lock

@@ -4864,9 +4864,9 @@ graphql-language-service@^3.1.2:
     graphql-language-service-types "^1.8.0"
 
 graphql@^15.4.0:
-  version "15.4.0"
-  resolved "https://registry.yarnpkg.com/graphql/-/graphql-15.4.0.tgz#e459dea1150da5a106486ba7276518b5295a4347"
-  integrity sha512-EB3zgGchcabbsU9cFe1j+yxdzKQKAbGUWRb13DsrsMN1yyfmmIq+2+L5MqVWcDCE4V89R5AyUOi7sMOGxdsYtA==
+  version "15.6.1"
+  resolved "https://registry.yarnpkg.com/graphql/-/graphql-15.6.1.tgz#9125bdf057553525da251e19e96dab3d3855ddfc"
+  integrity sha512-3i5lu0z6dRvJ48QP9kFxBkJ7h4Kso7PS8eahyTFz5Jm6CvQfLtNIE8LX9N6JLnXTuwR+sIYnXzaWp6anOg0QQw==
 
 growly@^1.3.0:
   version "1.3.0"

src/__tests__/utils/printSchemaOrdered.js

@@ -1,37 +1,5 @@
-import { parse, buildASTSchema } from 'graphql';
-import { printSchema } from 'graphql/utilities';
+import { lexicographicSortSchema, printSchema } from 'graphql/utilities';
 
 export default function printSchemaOrdered(originalSchema) {
-  // Clone schema so we don't damage anything
-  const schema = buildASTSchema(parse(printSchema(originalSchema)));
-
-  const typeMap = schema.getTypeMap();
-  Object.keys(typeMap).forEach(name => {
-    const gqlType = typeMap[name];
-
-    // Object?
-    if (gqlType.getFields) {
-      const fields = gqlType.getFields();
-      const keys = Object.keys(fields).sort();
-      keys.forEach(key => {
-        const value = fields[key];
-
-        // Move the key to the end of the object
-        delete fields[key];
-        fields[key] = value;
-
-        // Sort args
-        if (value.args) {
-          value.args.sort((a, b) => a.name.localeCompare(b.name));
-        }
-      });
-    }
-
-    // Enum?
-    if (gqlType.getValues) {
-      gqlType.getValues().sort((a, b) => a.name.localeCompare(b.name));
-    }
-  });
-
-  return printSchema(schema);
+  return printSchema(lexicographicSortSchema(originalSchema));
 }