chore(deps): update dependency graphql to v15.6.1

package.json

@@ -49,7 +49,7 @@
     "chai": "4.2.0",
     "chai-as-promised": "7.1.1",
     "coveralls": "3.1.0",
-    "graphql": "15.1.0",
+    "graphql": "15.6.1",
     "graphql-subscriptions": "1.1.0",
     "mocha": "8.0.1",
     "nyc": "15.1.0",

yarn.lock

@@ -1073,10 +1073,10 @@ [email protected]:
   dependencies:
     iterall "^1.2.1"
 
-graphql@15.1.0:
-  version "15.1.0"
-  resolved "https://registry.yarnpkg.com/graphql/-/graphql-15.1.0.tgz#b93e28de805294ec08e1630d901db550cb8960a1"
-  integrity sha512-0TVyfOlCGhv/DBczQkJmwXOK6fjWkjzY3Pt7wY8i0gcYXq8aogG3weCsg48m72lywKSeOqedEHvVPOvZvSD51Q==
+graphql@15.6.1:
+  version "15.6.1"
+  resolved "https://registry.yarnpkg.com/graphql/-/graphql-15.6.1.tgz#9125bdf057553525da251e19e96dab3d3855ddfc"
+  integrity sha512-3i5lu0z6dRvJ48QP9kFxBkJ7h4Kso7PS8eahyTFz5Jm6CvQfLtNIE8LX9N6JLnXTuwR+sIYnXzaWp6anOg0QQw==
 
 [email protected]:
   version "1.10.5"