WooCommerce Memberships 1.26.9

* Fix - Sensei `is_user_enrolled_in_course()` method not working as expected
* Fix - In some edge cases, product variations were restricted from purchase when they shouldn't have been
* Fix - Ensure subscription-linked memberships do not unexpectedly expire when the customer resubscribes
* Fix - When configuring a membership plan to auto-enroll in a course, users are now auto un-enrolled if/when their membership becomes inactive
* Fix - Remove deprecated usages of WooCommerce enhanced navigation feature

* Tweak - "Membership ending soon" emails are no longer sent for paused memberships
* Fix - Memberships connected to a subscription weren't inheriting the subscription's "End Date"

* Tweak - Improve performance around membership note count queries
* Fix - Modals in the admin area were not working (such as CSV import and export)
* Fix - Persist delayed member status on export