create: cargo install --locked

[dawidd6]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew tests with your changes locally?

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I see in homebrew-core recently a trend where maintainers suggest PR authors to append --locked flag to cargo install and it's reasonable.
I thought it might be a good idea to include this in template.

[issyl0]

Relevant Homebrew/homebrew-core PR for this “trend”: Homebrew/homebrew-core#45839

[MikeMcQuaid]

Thanks @issyl0!

[MikeMcQuaid]

Er, whoops it was @dawidd6, misread! Thanks @dawidd6!