Don't force Ruby platform.

[reitermarkus]

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• Have you added an explanation of what your changes do and why you'd like us to include them?
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• Have you successfully run brew tests with your changes locally?

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I have a ~/.bundle/config containing, among other things:

BUNDLE_FORCE_RUBY_PLATFORM: "true"

Running brew tests previously failed with

Your bundle only supports platforms ["aarch64-linux", "arm-linux", "arm64-darwin", "x86_64-darwin", "x86_64-linux"] but your local platform is ruby. Add the current platform to the lockfile with
`bundle lock --add-platform ruby` and try again.

Even if you add the ruby platform, brew tests fails since nokogiri needs native extensions:

Could not find nokogiri-1.13.10-x86_64-darwin in locally installed gems

[BrewTestBot]

Review period will end on 2023-02-09 at 03:53:07 UTC.

[MikeMcQuaid]

Seems reasonable to me, thanks @reitermarkus!

[BrewTestBot]

Review period skipped due to critical label.