hyperkit: deprecate

[chenrui333]

• 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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followup #172795

failed build log, https://github.com/Homebrew/homebrew-core/actions/runs/9395167391

  ==> expect test_hyperkit.exp
  spawn /usr/local/Cellar/hyperkit/0.20210107_1/bin/hyperkit -A -m 512M -s 0:0,hostbridge -s 31,lpc -l com1,stdio -f kexec,./vmlinuz,./initrd.gz,earlyprintk=serial console=ttyS0
  
  Using fd 8 for I/O notifications
  
  send: spawn id exp6 not open
      while executing
  "send "sudo halt\r\n""
      (file "test_hyperkit.exp" line 17)