Use postflight_steps in Homebrew cask

[Albert221]

Homebrew now warns when installing/upgrading the cask:

Warning: Calling `postflight` is deprecated! Use `postflight_steps` instead.

GoReleaser's hooks.post.install always generates a Ruby postflight do block, so this switches to custom_block to emit the declarative form:

postflight_steps do
  on_macos do
    run "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "{{staged_path}}/poe2arb"]
  end
end

({{staged_path}} is Homebrew's placeholder; it's escaped in .goreleaser.yaml so GoReleaser's templating outputs it literally.)

The committed Casks/poe2arb.rb is patched too, so users get rid of the warning without waiting for a release.

Note: GoReleaser places custom_block at the top of the cask — valid, just out of the conventional stanza order.

Testing

• goreleaser check passes; snapshot release renders the block above.
• brew reinstall --cask with the patched cask on Homebrew 7.0.6: no warning, quarantine attribute removed, binary runs.

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