WooCommerce Subscriptions 6.9.0

* New: Add support for admin users to re-display the staging site notice if it was previously hidden. PR#3321
* Fix: Revert a fix released in 2.5.4 which attempted to implement a workaround for SiteGround's staging sites. PR#3323 reverts: PR#3285

* Fix: Don't save empty product sale date ranges. Fixes an issue where the sale price appears in 1970 after a timezone offset change. PR#3283
* Fix: Validate subscription coupon types for non subscription and non-signup fee products. Fixes an issue where subscription coupons limited to 1 use never apply to some mixed carts. PR#3280
* Fix: Fix the PHP warnings that occur on the WP Dashboard page caused by incorrect use of args in a sprintf string. PR#3290
* Fix: Maintain any cart coupons when emptying the cart because of the store's mixed checkout settings. PR#3291
* Fix: Fix fatal errors when calling wcs_get_objects_property with a non-object parameter. PR#3308
* Fix: Use the raw SERVER_ADMIN variable to generate site URL on SiteGround sites. This fixes issues where SiteGround hosted staging sites weren't being recognized as staging sites due to SiteGround's special handling of the site url stored in the DB. PR#3285
* Fix: Don't check subscription limitation purchasability on admin screens. PR#3311
* Fix: Pass the 4th param to callbacks on woocommerce_checkout_create_order_shipping_item. PR#3317
* Fix: Remove order-specific e-mail actions from "Subscription actions" drop-down. PR#3299
* Fix: Add the item subtotal tax when manually renewing where the prices included tax. Fixes an issue where if the store's tax rates change, customers renewing manually may get a strange item price. PR#3286
* Tweak: Keep renewal orders "created_via" meta as "subscription" when paid via the checkout. PR#3301
* Tweak: Remove cancelled PayPal Reference Transactions Billing Agreements from manual, non-PayPal, and ended subscriptions. Fixes an issue where a cancelled subscription is reactivated and attempts to use a cancelled billing agreement. PR#3263
* Tweak: Increase the WC tested version to 3.6.0. PR#3313
* Tweak: Update Action Scheduler to 2.2.4. PR#3312
* New: Add a filter to allow 3rd parties to disable auto-switching. PR#3316

* New: Update Action Scheduler to version 2.2.1. PR#3266
* Fix: Display the subscription status names (rather than the raw status) in the edit subscription related orders table. PR#3272
* Fix: Use the correct endpoint for redirecting to the only available subscription on My Account. PR#3273
* Fix: [WPML] Keep language request args in Subscription My Account endpoint URLs. PR#3068
* Fix: Save the sale price schedule dates in UTC time (like WooCommerce core). PR#3270
* Fix: Use site time when checking if payment date and trial end date are same. Fixes issues with synced products with a trial. PR#3264
* Fix: Update retry report queries to refer to new retry tables. PR#3237
* Fix: Do not display the PayPal Profile ID on the edit subscription screen when the subscription is Manual Renewal. PR#3259
* Fix: Exclude `pending-cancel` subscriptions from anonymisation. PR#3256
* Fix: Pass the user ID and gateway ID parameters in the right order. Fixes issues with bulk updating customer payment tokens. PR#3258
* Fix: Temporarily lock payment on parent orders paid with PayPal Standard. Prevents customers paying twice while waiting for PayPal to respond. PR#2974
* Fix: Remove HTML from strings passed through translation functions. PR#3067
* Fix: Prevent endpoint settings having the same value. PR#3211
* Fix: Remove `strtolower()` uses on translated text. Prevents lowercasing translated text which may have language specific capitalisation. PR#3251
* Fix: Prevent possible fatal errors while populating the checkout with customer order data. Refactors the wcs_get_objects_property function. PR#3225
* Fix: Removes use of absint for amounts/totals in reports. PR#3242
* Fix: Display correct placeholder values for 'subject' and 'heading' e-mail settings #3246
* Fix: Do not load the view-subscription scripts when subscription can't be viewed or doesn't exist. PR#3235
* Fix: [WC3.6] Use new helper function to generate cart hash. PR#3215
* Tweak: Use 'WC_Order_Item_Product::get_product' wherever possible in 'WC_Subscriptions_Synchroniser'. PR#3230
* Tweak: Clarify the meaning of certain count values in subscription reports tool tips. PR#3143
* Tweak: Fixes various typos. PR#3276
* Dev: Add $cart as a parameter for the woocommerce_cart_subscription_string_details hook. PR#3257