WooCommerce Subscriptions 6.9.0

* Fix: Only set the payment method if it has changed via admin edit. PR#3646
* Fix: Performance issue in WCS_Payment_Tokens::get_subscriptions_from_token. PR#3649
* Fix: Exclude empty nonce.

* New: Add WC Admin Compatibility. PR#3628
* Fix: Restore the trial end date after reactivating a subscription which was cancelled. PR#3572
* Fix: Hide the order again button for orders which contain limited products. PR#3612
* Fix: Don't show recurring cart taxes when no taxes apply. PR#3633
* Fix: Prevent autocompleting orders which contain free, simple, non-digital products. PR#3621
* Fix: Remove redundant double line from customer report query. PR#3640
* Fix: [PayPal] Modify WC payload regex to account for alphanumeric chars. PR#3629
* Fix: Hide the free shipping label for free shipping and free local pickup options. PR#3618
* Fix: Prevent fatal errors when getting price for variable products which aren't synced. PR#3616
* Fix: Don't send WC core emails for subscription related orders when in Staging mode. PR#3576
* Fix: Update PayPal settings URL used in admin notices. PR#3617
* Tweak: Update wording in warning when attempting to change the subscription product type. PR#3623

* Fix: Support multiple modals on the customer's view subscription page. Fixes an issue where preventing the early renewal modal being displayed was preventing all modals on the page from being displayed. PR#3571
* Fix: Silence PHP warning in events by date report caused by empty set of data. PR#3577
* Fix: [WC3.7] Copy the rate percent meta to tax line items during renewal meta copy. PR#3578
* Fix: Introduce a user permissions check for the auto-renewal toggle. PR#3579
* Fix: Update Action Scheduler library to 3.0.1. This release includes a database tables schema version bump.