fix: #1872 Chang the type of createLocalVue method

[coolboy0961]

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

The PR fulfills these requirements:

• It's submitted to the dev branch.
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix #xxx[,#xxx], where "xxx" is the issue number)
• All tests are passing: https://github.com/vuejs/vue-test-utils/blob/dev/.github/CONTRIBUTING.md#development-setup
• New/updated tests are included

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature (to avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it)

Other information:

[coolboy0961]

@lmiller1990

Thank you for the review.
Can you tell me about when it will be released?

[lmiller1990]

I can do a release this weekend 👍

Please tag me if it is not released by Monday (19th July).

[coolboy0961]

@lmiller1990
Hello, This is a reminder for the release of this pull request.

[lmiller1990]

@coolboy0961 I have release 1.2.2: https://github.com/vuejs/vue-test-utils/releases/tag/v1.2.2