Auto merge of #3991 - rust-lang:renovate/npm-8.x, r=Turbo87

Update npm to v8

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [npm](https://docs.npmjs.com/) ([source](https://togithub.com/npm/cli)) | [`^7.0.0` -> `^8.0.0`](https://renovatebot.com/diffs/npm/npm/7.24.2/8.0.0) | [![age](https://badges.renovateapi.com/packages/npm/npm/8.0.0/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/npm/npm/8.0.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/npm/npm/8.0.0/compatibility-slim/7.24.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/npm/npm/8.0.0/confidence-slim/7.24.2)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>npm/cli</summary>

### [`v8.0.0`](https://togithub.com/npm/cli/blob/master/CHANGELOG.md#v800-2021-10-07)

[Compare Source](https://togithub.com/npm/cli/compare/v7.24.2...v8.0.0)

The purpose of this release is to drop support for old node versions and
to remove support for `require('npm')`.  There are no other breaking
changes.

##### BREAKING CHANGES

-   Drop support for node 10 and 11
-   Raise support ceiling in node 12 and 14 to LTS (^12.13.0/^14.15.0)
-   Drop support to `require('npm')`
-   Update subdependencies that also dropped node10 support

##### DEPENDENCIES

-   The following dependencies were updated to drop node10 support and
    update to the latest node-gyp
    -   libnpmversion@2.0.1
    -   pacote@12.0.0
    -   libnpmpack@3.0.0
    -   [`@&#8203;npmcli/arborist](https://togithub.com/npmcli/arborist)[@&#8203;3](https://togithub.com/3).0.0`
    -   libnpmfund@2.0.0
    -   libnpmexec@3.0.0
    -   node-gyp@8.2.0
-   [`8bd85cdae`](https://togithub.com/npm/cli/commit/8bd85cdae5eead60d5e92d6f1be27e88b480b1cb)
    [#&#8203;3813](https://togithub.com/npm/cli/issues/3813)
    `cli-columns@4.0.0`

</details>

---

### Configuration

📅 **Schedule**: At any time (no schedule defined).

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

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

---

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---

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Author: bors

package.json

@@ -132,7 +132,7 @@
   },
   "engines": {
     "node": "^14.9.0",
-    "npm": "^7.0.0"
+    "npm": "^8.0.0"
   },
   "ember": {
     "edition": "octane"