Upgrade mock-fs to version 5.1.1

[depfu]

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ mock-fs (^4.0.0 → ^5.1.1) · Repo · Changelog

Release Notes

5.1.1 (from changelog)

• Added engines to package.json to clarify that Node >= 12 is required (thanks @tillig, see #337)

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by 4 commits:

• 5.1.1
• Log changes
• Merge pull request #337 from tillig/patch-1
• `engines` block to specify min requirements

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[coveralls]

Coverage remained the same at 95.313% when pulling ebde10c on depfu/update/npm/mock-fs-5.1.1 into 309f5ed on master.

[depfu]

Closed in favor of #140.