fix(deps): update dependency graphql to v15 (#161)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

Diff for: packages/graphql-codegen-relay-optimizer-plugin/package.json

@@ -35,7 +35,7 @@
     "@graphql-codegen/testing": "1.17.7",
     "@types/jest": "24.9.1",
     "@types/relay-compiler": "8.0.0",
-    "graphql": "14.7.0",
+    "graphql": "15.3.0",
     "jest": "24.7.1",
     "ts-jest": "25.5.1",
     "typescript": "4.0.3"

Diff for: packages/todo-app-example/package.json

@@ -11,7 +11,7 @@
     "classnames": "2.2.6",
     "express": "4.17.1",
     "express-graphql": "0.11.0",
-    "graphql": "14.7.0",
+    "graphql": "15.3.0",
     "graphql-relay": "0.6.0",
     "graphql-tag": "2.11.0",
     "react": "16.13.1",

Diff for: yarn.lock

@@ -6217,7 +6217,12 @@ [email protected]:
     babel-plugin-macros "^2.5.0"
     graphql-tag "^2.10.1"
 
-[email protected], graphql@^14.5.3:
+[email protected]:
+  version "15.3.0"
+  resolved "https://registry.yarnpkg.com/graphql/-/graphql-15.3.0.tgz#3ad2b0caab0d110e3be4a5a9b2aa281e362b5278"
+  integrity sha512-GTCJtzJmkFLWRfFJuoo9RWWa/FfamUHgiFosxi/X1Ani4AVWbeyBenZTNX6dM+7WSbbFfTo/25eh0LLkwHMw2w==
+
+graphql@^14.5.3:
   version "14.7.0"
   resolved "https://registry.yarnpkg.com/graphql/-/graphql-14.7.0.tgz#7fa79a80a69be4a31c27dda824dc04dac2035a72"
   integrity sha512-l0xWZpoPKpppFzMfvVyFmp9vLN7w/ZZJPefUicMCepfJeQ8sMcztloGYY9DfjVPo6tIUDzU5Hw3MUbIjj9AVVA==