Auto merge of #2821 - rust-lang:renovate/eslint-config-prettier-6.x, r=Turbo87

Update dependency eslint-config-prettier to v6.12.0

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [eslint-config-prettier](https://togithub.com/prettier/eslint-config-prettier) | devDependencies | minor | [`6.11.0` -> `6.12.0`](https://renovatebot.com/diffs/npm/eslint-config-prettier/6.11.0/6.12.0) |

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### Release Notes

<details>
<summary>prettier/eslint-config-prettier</summary>

### [`v6.12.0`](https://togithub.com/prettier/eslint-config-prettier/blob/master/CHANGELOG.md#Version-6120-2020-09-25)

[Compare Source](https://togithub.com/prettier/eslint-config-prettier/compare/v6.11.0...v6.12.0)

-   Added: [`@&#8203;typescript-eslint/comma-dangle].` Thanks to Masafumi Koba ([`@&#8203;ybiquitous](https://togithub.com/ybiquitous))!!`

</details>

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### Renovate configuration

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:vertical_traffic_light: **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

:recycle: **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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

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 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

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Author: bors

package-lock.json

@@ -97,7 +97,7 @@
     "ember-web-app": "5.0.0",
     "ember-window-mock": "0.7.1",
     "eslint": "7.9.0",
-    "eslint-config-prettier": "6.11.0",
+    "eslint-config-prettier": "6.12.0",
     "eslint-plugin-ember": "9.0.0",
     "eslint-plugin-import-helpers": "1.1.0",
     "eslint-plugin-prettier": "3.1.4",