Auto merge of #2849 - rust-lang:renovate/ember-source-3.21.x, r=Turbo87

Update dependency ember-source to v3.21.2

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [ember-source](https://emberjs.com/) ([source](https://togithub.com/emberjs/ember.js)) | devDependencies | patch | [`3.21.1` -> `3.21.2`](https://renovatebot.com/diffs/npm/ember-source/3.21.1/3.21.2) |

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### Release Notes

<details>
<summary>emberjs/ember.js</summary>

### [`v3.21.2`](https://togithub.com/emberjs/ember.js/blob/master/CHANGELOG.md#v3212-September-30-2020)

[Compare Source](https://togithub.com/emberjs/ember.js/compare/v3.21.1...v3.21.2)

-   [#&#8203;19138](https://togithub.com/emberjs/ember.js/pull/19138) [BUGFIX] Fix tag cycles in query parameters
-   [#&#8203;19164](https://togithub.com/emberjs/ember.js/pull/19164) [BUGFIX] Entangles custom EmberArray implementations when accessed with `Ember.get`

</details>

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:no_bell: **Ignore**: Close this PR and you won't be reminded about this update again.

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Author: bors

package-lock.json

@@ -90,7 +90,7 @@
     "ember-qunit": "4.6.0",
     "ember-resolver": "8.0.2",
     "ember-router-scroll": "2.0.2",
-    "ember-source": "3.21.1",
+    "ember-source": "3.21.2",
     "ember-svg-jar": "2.2.3",
     "ember-template-lint": "2.13.0",
     "ember-test-selectors": "5.0.0",