#1273 - Unknown collation: 'utf8mb4_0900_ai_ci' why?

Hello, on old webserver have MySQL 8.0 and can´t open anymore PHPmyadmin(can´t change the collation). I exported the DB, but always this error:

Error
SQL query: Copy

CREATE TABLE wp_commercekit_searches (
id int NOT NULL AUTO_INCREMENT,
search_term varchar(100) NOT NULL,
search_count int NOT NULL DEFAULT ‘0’,
click_count int NOT NULL DEFAULT ‘0’,
no_result_count int NOT NULL DEFAULT ‘0’,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

MySQL said: Documentation
#1273 - Unknown collation: ‘utf8mb4_0900_ai_ci’

How resolve it?