chore(deps): update dependency graphql to v16

Author: renovate[bot]

package.json

@@ -22,7 +22,7 @@
     "apollo-server": "2.21.0",
     "apollo-server-testing": "2.21.0",
     "cz-conventional-changelog": "3.3.0",
-    "graphql": "15.5.0",
+    "graphql": "16.8.1",
     "jest": "26.6.3",
     "prettier": "2.2.1",
     "rollup": "2.40.0"

yarn.lock

@@ -2632,10 +2632,10 @@ graphql-tools@^4.0.8:
     iterall "^1.1.3"
     uuid "^3.1.0"
 
-graphql@15.5.0:
-  version "15.5.0"
-  resolved "https://registry.yarnpkg.com/graphql/-/graphql-15.5.0.tgz#39d19494dbe69d1ea719915b578bf920344a69d5"
-  integrity sha512-OmaM7y0kaK31NKG31q4YbD2beNYa6jBBKtMFT6gLYJljHLJr42IqJ8KX08u3Li/0ifzTU5HjmoOOrwa5BRLeDA==
+graphql@16.8.1:
+  version "16.8.1"
+  resolved "https://registry.yarnpkg.com/graphql/-/graphql-16.8.1.tgz#1930a965bef1170603702acdb68aedd3f3cf6f07"
+  integrity sha512-59LZHPdGZVh695Ud9lRzPBVTtlX9ZCV150Er2W43ro37wVof0ctenSaskPPjN7lVTIN8mSZt8PHUNKZuNQUuxw==
 
 growly@^1.3.0:
   version "1.3.0"