chore: update dependency yeoman-test to v3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
yeoman-test (source)	devDependencies	major	~2.7.0 -> ~3.0.0

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Release Notes

yeoman/yeoman-test

v3.0.0

Compare Source

• Implement withMockedGenerators. af0e8f1
• Implement dumpFiles and dumpFilenames. eeb3dd8
• Implement createEnv to allow to override with mock for the entire test. cbf83b5
• Remove deprecated callback from prompt. fdc97f3
• Implement option to throw on missing answer. bbc0d2d
• Set newErrorHandler as default. 7bda4c6
• Implement RunResult.create 9cef47c 2d51f81
• Change supported node version to 12 and 14 61bad00
• Listen to environment&#​39;s events instead of generator&#​39;s 89cc525

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[raymondfeng]

Hmm, CI fails with Node 10 only.

[dhmlau]

@jannyHou, could you please take a look? Thanks.

[bajtos]

The changelogs says:

Change supported node version to 12 and 14

I think that means we need to put this PR on hold until we can drop support for Node.js 10 (in May 2021)? See https://github.com/nodejs/Release

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