fvm 4.0.5 (new formula)

[zeldrisho]

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• 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 HOMEBREW_NO_INSTALL_FROM_API=1 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 HOMEBREW_NO_INSTALL_FROM_API=1 brew install --build-from-source <formula>)? If this is a new formula, does it pass brew audit --new <formula>?

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• AI was used to generate or assist with generating this PR. Please specify below how you used AI to help you, and what steps you have taken to manually verify the changes.

I used Codex to help update Formula/f/fvm.rb, debug the Linux CI failure, and prepare the PR note.

Manual verification performed:

• Ran HOMEBREW_NO_INSTALL_FROM_API=1 brew reinstall --build-from-source fvm.
• Ran brew test --verbose fvm.
• Ran brew style Formula/f/fvm.rb.
• Ran brew audit --strict fvm.
• Ran brew audit --new fvm.

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[Copilot]

Pull request overview

This PR removes the head install option from the fvm Homebrew formula and drops the now-dead code path that depended on build.head?, keeping the formula focused on stable releases.

Changes:

• Remove the head stanza from fvm.
• Remove the unreachable build.head? conditional logic tied to head builds.

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