WooCommerce Bookings 2.1.2

* Add - Support for High-performance Order Storage ("HPOS") (formerly known as Custom Order Tables, "COT").
* Dev - Bump NPM from 5.5.1 to 6.14.17.
* Dev - Bump node from 8.9.3 to 16.17.1.
* Fix - Admin calendar schedule view when a booking spans multiple days or months.
* Fix - Availability for adjacent multi-date bookings.
* Fix - Fixed bookable time issue of Google Calendar's recurring events.
* Tweak - Upgrade NPM dependencies.
* Tweak - WC 7.1.0 compatibility.

* Add - Declare compatibility with High-Performance Order Storage ("HPOS").
* Fix - Admin access for bulk action requests.

* Fix - Prevent bookings and display end-times in unavailable times on another day.
* Fix - Resource cost not included in booking cost when `=` used in booking cost ranges.
* Tweak - Bump minimum WooCommerce version from 2.6 to 6.0.
* Tweak - Prevent unneeded ajax calls to wc_bookings_calculate_costs to improve performance.
* Tweak - Set minimum PHP version to 7.0.
* Tweak - Set minimum WordPress version to 5.6