WooCommerce Subscriptions 6.9.0

* Fix: Points and Rewards discounts (including WC Coupons when Points and Rewards is active) being removed from the cart when applied on the checkout page.
* Fix: Subscriptions with one-time shipping having shipping charged on all renewal orders.
* Fix: Rare fatal error caused by missing WC_Query class.
* Fix: Make loading the variation edit product tab more performant on large sites.
* Fix: Add a primary key to the last payment temporary table to improve compatibility with some hosts on larger sites.
* Tweak: Update the wording when a customer edits their subscription address that this applies to "future renewals".
* Dev: Add missing `woocommerce_rest_pre_insert_shop_subscription_object` filter to prepare_object_for_database() within the Subscriptions REST API controller class.
* Dev: Add a `data-payment-method` attribute to the Early Renewal modal button action.

* Fix: Switch calculations not correctly charging the full sign up fee when the "Prorate Sign up Fee" option is set to "Never (charge the full sign up fee)". PR#4096
* Fix: Fixes PayPal Reference Transactions integration with Checkout blocks. PR#4105
* Fix: Set the updated payment token on all pending-payment renewals so that manually retrying a failed payment uses the updated token set on the subscription. PR#4108
* Dev: Moved the `WC_Subscriptions::enqueue_scripts` and` WC_Subscriptions::equeue_styles` static functions to the new `WC_Subscriptions_Frontend_Scripts` class (deprecated existing functions). PR#4104

* Fix: Don't show recurring shipping method selection when the rates and options match the initial cart options. PR#4091
* Fix: Update the recurring shipping totals on selection and fix invalid recurring shipping method notices. PR#4099
* Fix: Update the subscription shipping address after on switch. PR#4095