fix(casks): update depends_on macos syntax to resolve Homebrew deprecation warnings

[Zettt]

Fixes Homebrew deprecation warnings emitted during brew update and brew upgrade.

• Replaced deprecated depends_on macos: ">= :<version>" string comparison syntax with modern symbol syntax (depends_on macos: :big_sur and depends_on macos: :ventura).
• Reordered Cask stanzas and array items to comply with brew style (Homebrew/OSDependsOn cop).

Changes

• Casks/open-codesign.rb:
  • depends_on macos: ">= :big_sur" -> depends_on macos: :big_sur
  • Reordered url, sha256, zap, and caveats stanzas per Homebrew Cask specification.
  • Alphabetized zap trash paths.
• Casks/open-cowork.rb:
  • depends_on macos: ">= :ventura" -> depends_on macos: :ventura
  • Reordered zap and caveats stanzas.

Verification

Ran brew style locally:

$ brew style Casks/open-codesign.rb Casks/open-cowork.rb
2 files inspected, no offenses detected

Fixes #1 and #2.