check if o.hasOwnProperty is function

[jorisroling]

Defence against the following error we have...

"stack": [
  "TypeError: o.hasOwnProperty is not a function",
  "    at /Users/joris/CLIENT/PROJECT/node_modules/apollo-utilities/src/util/maybeDeepFreeze.ts:9:9",
  "    at Array.forEach (<anonymous>)",
  "    at deepFreeze (/Users/joris/CLIENT/PROJECT/node_modules/apollo-utilities/src/util/maybeDeepFreeze.ts:7:33)",
  "    at /Users/joris/CLIENT/PROJECT/node_modules/apollo-utilities/src/util/maybeDeepFreeze.ts:14:7",
  "    at Array.forEach (<anonymous>)",
  "    at deepFreeze (/Users/joris/CLIENT/PROJECT/node_modules/apollo-utilities/src/util/maybeDeepFreeze.ts:7:33)",
  "    at Object.maybeDeepFreeze (/Users/joris/CLIENT/PROJECT/node_modules/apollo-utilities/src/util/maybeDeepFreeze.ts:29:14)",
  "    at /Users/joris/CLIENT/PROJECT/node_modules/src/core/QueryManager.ts:593:31",
  "    at /Users/joris/CLIENT/PROJECT/node_modules/src/core/QueryManager.ts:1028:11",
  "    at Array.forEach (<anonymous>)",
  "    at /Users/joris/CLIENT/PROJECT/node_modules/src/core/QueryManager.ts:1027:10",
  "    at Map.forEach (<anonymous>)",
  "    at QueryManager.broadcastQueries (/Users/joris/CLIENT/PROJECT/node_modules/src/core/QueryManager.ts:1021:18)",
  "    at Object.next (/Users/joris/CLIENT/PROJECT/node_modules/src/core/QueryManager.ts:1094:18)",
  "    at notifySubscription (/Users/joris/CLIENT/PROJECT/node_modules/zen-observable/lib/Observable.js:126:18)",
  "    at onNotify (/Users/joris/CLIENT/PROJECT/node_modules/zen-observable/lib/Observable.js:161:3)"

Fixes #3426.

[apollo-cla]

@jorisroling: Thank you for submitting a pull request! Before we can merge it, you'll need to sign the Meteor Contributor Agreement here: https://contribute.meteor.com/

[apollo-cla]

	Warnings
⚠️	There are library changes, but not tests. That's OK as long as you're refactoring existing code

Generated by 🚫 dangerJS

[hwillson]

Thanks for submitting this PR @jorisroling! I've adjusted things a little (switched to using Object.prototype.hasOwnProperty instead and added tests to make sure we don't regress in the future), but we should be all set here. LGTM!