fix: Keep notarizing macOS binaries ourselves

  The new `electron-builder` version includes `@electron/notarize` to
  simplify notarizing macOS binaries.

  However, it seems there are bugs with the method we choose to identify
  our Apple team and software which prevents the notarization.
  Therefore we'll disable `electron-builder`'s internal notarization for
  now and keep doing it ourselves as it works fine.

electron-builder.yml

@@ -47,6 +47,7 @@ mac:
       - target: dmg
         arch:
             - x64
+  notarize: false # XXX: we do it ourselves in afterSign
 dmg:
   contents:
     - x: 110