Update the @apollo/client dep to pull in ts-invariant changes

The issues fixed by #460 didn't quite go far enough. This commit
updates to more recent versions of `@apollo/client`, and ultimately
`ts-invariant`, to pull in the changes made in
apollographql/invariant-packages#94.

Fixes #457

package.json

@@ -27,7 +27,7 @@
     "postinstall": "cd node_modules/graphiql-forked/packages/graphiql && npm install --production"
   },
   "dependencies": {
-    "@apollo/client": "latest",
+    "@apollo/client": "^3.4.0-beta.15",
     "@apollo/space-kit": "^9.0.1-canary.317.8374.0",
     "@emotion/cache": "^11.1.3",
     "@emotion/react": "^11.1.5",