You recently upgraded your MySQL installation to MySQL 8.

[mysqld]

default_authentication_plugin=sha256_password

ALTER USER user -

IDENTIFIED WITH mysql_native_password

BY 'password';

[mysqld]

default_authentication_plugin=caching_sha2_password

ALTER USER user -

IDENTIFIED WITH caching_sha2_password

BY 'password';

ALTER USER user -

IDENTIFIED WITH sha256_password -

BY 'password';

[mysqld]

default_authentication_plugin=mysql_native_password