Update octokit graphql type dependencies (#228)

* Update GraphQL support in base API

packages/github/src/github.ts

@@ -1,5 +1,11 @@
 // Originally pulled from https://github.com/JasonEtco/actions-toolkit/blob/master/src/github.ts
-import {GraphQlQueryResponse, Variables, defaults} from '@octokit/graphql'
+import {graphql} from '@octokit/graphql'
+
+// we need this type to set up a property on the GitHub object
+// that has token authorization
+// (it is not exported from octokit by default)
+import {graphql as GraphQL} from '@octokit/graphql/dist-types/types'
+
 import Octokit from '@octokit/rest'
 import * as Context from './context'
 
@@ -9,14 +15,12 @@ Octokit.prototype = new Octokit()
 export const context = new Context.Context()
 
 export class GitHub extends Octokit {
-  graphql: (
-    query: string,
-    variables?: Variables
-  ) => Promise<GraphQlQueryResponse>
+  graphql: GraphQL
 
   constructor(token: string, opts: Omit<Octokit.Options, 'auth'> = {}) {
     super({...opts, auth: `token ${token}`})
-    this.graphql = defaults({
+
+    this.graphql = graphql.defaults({
       headers: {authorization: `token ${token}`}
     })
   }