Calling string comparison format for `depends_on macos:` is deprecated!

[Zettt]

Using brew update && brew upgrade gives multiple warnings (always the same one) with this tap:

Warning: Calling string comparison format for `depends_on macos:` is deprecated! Use `depends_on macos: :big_sur` instead.
Please report this issue to the opencoworkai/homebrew-tap tap (not Homebrew/* repositories), or even better, submit a PR to fix it:
  /opt/homebrew/Library/Taps/opencoworkai/homebrew-tap/Casks/open-codesign.rb:25