fix(cask): replace deprecated postflight hook

[emmmile]

Replaces the deprecated postflight Cask hook with postflight_steps, preserving the existing macOS quarantine-removal command and eliminating Homebrew's deprecation warning. Deliberately omitted: no version, artifact, or installation-behavior changes.

Basically fixes this warning:

Warning: Calling `postflight` is deprecated! Use `postflight_steps` instead.
Please report this issue to the runware/homebrew-tap tap (not Homebrew/* repositories), or even better, submit a PR to fix it:
  /opt/homebrew/Library/Taps/runware/homebrew-tap/Casks/runware.rb:36

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[Copilot]

🟡 Changes recommended

The hook uses unsupported DSL constructs, and the generated source must also be updated.

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Pull request overview

Replaces the deprecated postflight Cask hook with postflight_steps while preserving quarantine removal.

Changes:

• Updates the Cask lifecycle hook.
• Retains macOS quarantine-removal logic.

File summaries

File	Summary
Casks/runware.rb	Updates the generated Cask hook; the implementation requires the supported step DSL and generator source update.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 2
• Review effort level: Lite

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[emmmile]

Closing: this Cask is generated by GoReleaser, so a tap-only edit would be overwritten on the next release. The durable fix belongs in the release generator/update path.