docker-machine: remove deprecate comment

[chenrui333]

• Have you followed the guidelines for contributing?
• Have you ensured that your commits follow the commit style guide?
• Have you checked that there aren't other open pull requests for the same formula update/change?
• Have you built your formula locally with brew install --build-from-source <formula>, where <formula> is the name of the formula you're submitting?
• Is your test running fine brew test <formula>, where <formula> is the name of the formula you're submitting?
• Does your build pass brew audit --strict <formula> (after doing brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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As gitlab is actively maintaining the fork, I think it is good to remove the deprecate comment

[carlocab]

Related: #106902 (comment)

[SMillerDev]

Gitlab sees it as deprecated though. I disagree with this.

[SMillerDev]

I think we should deprecate the dependents too

[chenrui333]

I see, I will also raise a gitlab issue before further pursuing this. (in terms of maintenance commitment)

For the dependents, I agree, most of them are not being actively maintained.

[chenrui333]

Gonna close this for now. Thanks folks!