chore(deps): update dependency graphql-yoga to v1.9.1

Author: renovate-bot

example/package.json

@@ -5,7 +5,7 @@
   },
   "dependencies": {
     "graphql-binding-github": "0.3.21",
-    "graphql-yoga": "1.9.0"
+    "graphql-yoga": "1.9.1"
   },
   "now": {
     "alias": "graphql-binding-github"

example/yarn.lock

@@ -547,9 +547,9 @@ graphql-tools@^2.23.1:
     iterall "^1.1.3"
     uuid "^3.1.0"
 
-[email protected].0:
-  version "1.9.0"
-  resolved "https://registry.yarnpkg.com/graphql-yoga/-/graphql-yoga-1.9.0.tgz#d6854be9e5b1225430d52f90b95e62404da57c8c"
+[email protected].1:
+  version "1.9.1"
+  resolved "https://registry.yarnpkg.com/graphql-yoga/-/graphql-yoga-1.9.1.tgz#1e83ac8d4c262cc28397f6b21acd7d894bcf1f4c"
   dependencies:
     "@types/cors" "^2.8.3"
     "@types/express" "^4.11.1"