fix(deps): update dependency graphql to v16

package.json

@@ -65,7 +65,7 @@
   "dependencies": {
     "@sourcegraph/extension-api-classes": "^1.1.0",
     "@types/sinon": "10.0.4",
-    "graphql": "^15.4.0",
+    "graphql": "^16.8.1",
     "rxjs": "^6.5.1",
     "sinon": "^10.0.0",
     "sourcegraph": "^25.7.0"

yarn.lock

@@ -3187,10 +3187,10 @@ graceful-fs@^4.1.11, graceful-fs@^4.1.15, graceful-fs@^4.1.2, graceful-fs@^4.1.6
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.4.tgz#2256bde14d3632958c465ebc96dc467ca07a29fb"
   integrity sha512-WjKPNJF79dtJAVniUlGGWHYGz2jWxT6VhN/4m1NdkbZ2nOsEF+cI1Edgql5zCRhs/VsQYRvrXctxktVXZUkixw==
 
-graphql@^15.4.0:
-  version "15.7.2"
-  resolved "https://registry.yarnpkg.com/graphql/-/graphql-15.7.2.tgz#85ab0eeb83722977151b3feb4d631b5f2ab287ef"
-  integrity sha512-AnnKk7hFQFmU/2I9YSQf3xw44ctnSFCfp3zE0N6W174gqe9fWG/2rKaKxROK7CcI3XtERpjEKFqts8o319Kf7A==
+graphql@^16.8.1:
+  version "16.8.1"
+  resolved "https://registry.yarnpkg.com/graphql/-/graphql-16.8.1.tgz#1930a965bef1170603702acdb68aedd3f3cf6f07"
+  integrity sha512-59LZHPdGZVh695Ud9lRzPBVTtlX9ZCV150Er2W43ro37wVof0ctenSaskPPjN7lVTIN8mSZt8PHUNKZuNQUuxw==
 
 [email protected]:
   version "1.10.5"