legitify: deprecate

[branchv]

• 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 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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go 1.26 will be released next month, at which point we'll deprecate go 1.24 (per https://go.dev/doc/devel/release#policy). meanwhile, this is stuck on 1.24 without any response to Legit-Labs/legitify#350 and hasn't had a release since 2024

==> Analytics
install: 17 (30 days), 29 (90 days), 128 (365 days)
install-on-request: 17 (30 days), 29 (90 days), 128 (365 days)
build-error: 0 (30 days)