Drupal\Core\Database\Connection::nextId(), the {sequences} table and schema are deprecated

The methods Drupal\Core\Database\Connection::nextId() and Drupal\mysql\Driver\Database\mysql\nextIdDelete() are deprecated and will be removed in Drupal 11.0.
The sequences table is deprecated and will be removed in Drupal 12.0. There is no replacement for the deprecated functionality. If needed, create your own implementation to create a new and unused integer value or change the table colum that is used for the primary key to a serial type.

Installing the table sequences with the method KernelTestBase::installSchema() is deprecated. The following code is no longer necessary and should be removed:

$this->installSchema('system', ['sequences']);