upgrade graphql-tools to v6 (#6701)

* upgrade to v6

* remove old graphql-tools package

Co-authored-by: Antonio Davi Macedo Coelho de Castro <adavimacedo@gmail.com>

package.json

@@ -20,6 +20,8 @@
   "license": "BSD-3-Clause",
   "dependencies": {
     "@apollographql/graphql-playground-html": "1.6.24",
+    "@graphql-tools/stitch": "^6.0.0",
+    "@graphql-tools/utils": "^6.0.0",
     "@parse/fs-files-adapter": "1.0.1",
     "@parse/push-adapter": "3.2.0",
     "@parse/s3-files-adapter": "1.4.0",
@@ -35,7 +37,6 @@
     "graphql": "15.0.0",
     "graphql-list-fields": "2.0.2",
     "graphql-relay": "^0.6.0",
-    "graphql-tools": "^5.0.0",
     "graphql-upload": "11.0.0",
     "intersect": "1.0.1",
     "jsonwebtoken": "8.5.1",