Deprecated Warning with PHP8.1

After updating our PHP version from 7.4 to 8.1 our site is filled with the following error messages:

Deprecated: Return type of FS_Key_Value_Storage::offsetUnset($k) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in ………/wp-content/plugins/quick-contact-form/vendor/freemius/wordpress-sdk/includes/managers/class-fs-key-value-storage.php on line 313

We are on WordPress 6.1.1 and have since turned off our debug mode but any help to fix this warning will be really appreciated.

Thanks