Deprecation warning by `wp-env`

[ernilambar]

After upgrading @wordpress/env (v11+), running wp-env start prints output like:

Warning: wp-env starts both development and tests environments by default.
This behavior is deprecated and will be removed in a future version.
To avoid this warning, add "testsEnvironment": false to your .wp-env.json.
The "env", "testsPort", and "testsEnvironment" options are also deprecated.
Use the --config option with a separate config file for test environments instead.