gdm: deprecate

[branchvincent]

• 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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Last tag was 2016 and no reponse from sparrc/gdm#29

[chenrui333]

seems building/testing fine with go1.20.5??

[branchvincent]

that's true, I was just going through the GOPATH epic #47627 and deprecating formulae that haven't seen a commit/release in years and didn't respond to our request for using modules

[iMichka]

Agreed.
Download stats look empty too:
==> Analytics
install: 0 (30 days), 0 (90 days), 0 (365 days)
install-on-request: 0 (30 days), 0 (90 days), 0 (365 days)
build-error: 0 (30 days)