WooCommerce Subscriptions 6.9.0

* Fix: Resolved an issue that prevented the "Used for variations" checkbox to not be enabled on the edit product page load causing variations to be deleted erroneously.
* Dev: Fixed wcs_get_subscription_orders() returning an empty list when querying parent orders when HPOS is enabled with data syncing off.
* Dev: Use the WC_VERSION constant when determining the active WooCommerce version inside our dependency manager if it's defined.
* Dev: Updated subscriptions-core to 6.1.0

* Fix: Ensure when a customer changes the shipping method on cart and checkout that the recurring totals correctly reflect the chosen method.
* Fix: Resolve an issue that prevented the "Used for variations" checkbox from being enabled on the variable subscription product edit screen on WC version v7.9.0.
* Fix: When HPOS is enabled, the `wc/v3/subscriptions` REST API endpoint will now fetch subscriptions of all statuses.
* Dev: Filter the WC_Order_Query args to properly query subscription statuses when HPOS is enabled.
* Dev: Updated subscriptions-core to 6.0.0

* Fix: Resolved an issue with customers being redirected to an incorrect Pay for Order URL after login.
* Dev: Updated subscriptions-core to 5.7