Homebrew warning: `postflight` is deprecated; use `postflight_steps`

[atacan]

Description

Homebrew emits the following deprecation warning for the go-task cask:

Warning: Calling `postflight` is deprecated! Use `postflight_steps` instead.
Please report this issue to the go-task/homebrew-tap tap (not Homebrew/* repositories), or even better, submit a PR to fix it:
  /opt/homebrew/Library/Taps/go-task/homebrew-tap/Casks/go-task.rb:40

This appears to come from Casks/go-task.rb around line 40, where the cask still uses the deprecated postflight stanza.

Expected behavior: Installing or upgrading the cask should not emit Homebrew deprecation warnings.

Suggested fix: Migrate the cask from postflight to postflight_steps per the current Homebrew Cask DSL.

Version

3.53.1

Operating system

macOS

Experiments Enabled

No response

Example Taskfile

[vmaerten]

Related to goreleaser/goreleaser#6870

[Gaardsholt]

If we get the binary signed and notarized, I guess this preflight isn't needed anymore?
Goreleaser can handle that for you through the notarize block.