Fix deprecated postflight stanza in the generated Homebrew cask

.goreleaser.yaml

@@ -83,12 +83,17 @@ homebrew_casks:
       bash: completions/lstk.bash
       zsh: completions/lstk.zsh
       fish: completions/lstk.fish
-    hooks:
-      post:
-        install: |
-          if OS.mac?
-            # The whole staged dir, not only lstk: the bundled extensions binary
-            # sits next to it and would otherwise be blocked by Gatekeeper on its
-            # first run.
-            system_command "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "#{staged_path}"]
-          end
+    # hooks.post.install emits Homebrew's deprecated `postflight`; the
+    # replacement arrives as hooks.post.install_steps in GoReleaser v2.19
+    # (goreleaser/goreleaser#6873). Until then custom_block writes the stanza,
+    # escaping `{{staged_path}}` past GoReleaser's template pass. It renders
+    # first in the cask, so `brew style` reports stanza-order offences.
+    custom_block: |
+      postflight_steps do
+        on_macos do
+          # The whole staged dir, not only lstk: the bundled extensions binary
+          # sits next to it and would otherwise be blocked by Gatekeeper on its
+          # first run.
+          run "/usr/bin/xattr", args: ["-dr", "com.apple.quarantine", "{{ "{{staged_path}}" }}"]
+        end
+      end