Update dependency cross-spawn to v7 (#307)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [cross-spawn](https://togithub.com/moxystudio/node-cross-spawn) | [`6.0.5` -> `7.0.3`](https://renovatebot.com/diffs/npm/cross-spawn/6.0.5/7.0.3) | [![age](https://developer.mend.io/api/mc/badges/age/npm/cross-spawn/7.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/cross-spawn/7.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/cross-spawn/6.0.5/7.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/cross-spawn/6.0.5/7.0.3?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>moxystudio/node-cross-spawn (cross-spawn)</summary>

### [`v7.0.3`](https://togithub.com/moxystudio/node-cross-spawn/blob/HEAD/CHANGELOG.md#703-2020-05-25)

[Compare Source](https://togithub.com/moxystudio/node-cross-spawn/compare/v7.0.2...v7.0.3)

### [`v7.0.2`](https://togithub.com/moxystudio/node-cross-spawn/blob/HEAD/CHANGELOG.md#702-2020-04-04)

[Compare Source](https://togithub.com/moxystudio/node-cross-spawn/compare/v7.0.1...v7.0.2)

### [`v7.0.1`](https://togithub.com/moxystudio/node-cross-spawn/blob/HEAD/CHANGELOG.md#701-2019-10-07)

[Compare Source](https://togithub.com/moxystudio/node-cross-spawn/compare/v7.0.0...v7.0.1)

### [`v7.0.0`](https://togithub.com/moxystudio/node-cross-spawn/blob/HEAD/CHANGELOG.md#700-2019-09-03)

[Compare Source](https://togithub.com/moxystudio/node-cross-spawn/compare/v6.0.5...v7.0.0)

##### ⚠ BREAKING CHANGES

-   drop support for Node.js < 8

-   drop support for versions below Node.js 8 ([#&#8203;125](https://togithub.com/moxystudio/node-cross-spawn/issues/125)) ([16feb53](https://togithub.com/moxystudio/node-cross-spawn/commit/16feb53))

</details>

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package.json

@@ -122,7 +122,7 @@
     "create-next-app": "workspace:*",
     "critters": "0.0.20",
     "cross-env": "7.0.3",
-    "cross-spawn": "6.0.5",
+    "cross-spawn": "7.0.3",
     "dd-trace": "4.16.0",
     "es5-ext": "0.10.62",
     "escape-string-regexp": "2.0.0",