chore(release): drop macOS quarantine workaround from release notes

The mac DMGs are now signed with a Developer ID and notarized, so Gatekeeper
no longer shows the "app is damaged" error and the xattr quarantine command
is no longer needed.

scripts/release-body.js

@@ -81,8 +81,6 @@ const section = (title, lines) => {
 const macSection = section('macOS', [
   macArm && `- Apple Silicon (arm64): [Download DMG](${linkTo(macArm)})`,
   macX64 && `- Intel (x64): [Download DMG](${linkTo(macX64)})`,
-  mac.length > 0 &&
-    `- If macOS shows "5chan.app is damaged and can't be opened. You should move it to the Trash.", run this in Terminal to fix it: \`xattr -dr com.apple.quarantine "/Applications/5chan.app"\` then open the app again.`,
 ]);
 
 const winSection = section('Windows', [