Do not insist on using macOS texinfo

[fxcoudert]

• 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.
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• Have you successfully run brew tests with your changes locally?

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macOS texinfo is left at an old version, and is not present on newer version (Ventura and later). We have migrated all of homebrew-core versions to using Homebrew's texinfo when necessary (like in Homebrew/homebrew-core#114068 and friends), but the audit still triggers in some cases: Homebrew/homebrew-core#135322

It's high time we stop insisting on using macOS texinfo. I actually thought I had done that already a couple of months ago :)

[fxcoudert]

Audit does not deal with texinfo being keg-only only on some macOS versions. Either we ignore the audit, or we make texinfo not-keg-only. I'm all for the second (simplify maintenance across macOS versions). Opinions?

[MikeMcQuaid]

Good once test failure fixed: https://github.com/Homebrew/brew/actions/runs/5561773078/jobs/10159668546?pr=15681#step:5:12

[p-linnane]

Audit does not deal with texinfo being keg-only only on some macOS versions. Either we ignore the audit, or we make texinfo not-keg-only. I'm all for the second (simplify maintenance across macOS versions). Opinions?

Agreed with the second option. Better to improve things moving forward.

[fxcoudert]

Opened companion PR in homebrew-core: Homebrew/homebrew-core#136838

[MikeMcQuaid]

Thanks @fxcoudert!