Dependency-only release. Widens the Jetpack Autoloader constraint from
^5.0 to ^6.0. v6.0.0 only raised that package's own minimum PHP to 7.4,
already covered by this library's php: >=8.1; v6.0.1 fixes manifest
version-tie resolution so a plugin directory retired by a host deploy
cannot win a tie.

No library API, stored data, filter, or class-name changes. Consumer
plugins that pin the autoloader in their own composer.json must widen
that constraint to ^6.0 (or ^5.0 || ^6.0) before upgrading.