MySQL 5.7 SSL configuration

[cursor]

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This PR addresses a bug where the MySQL 8.0 client, when used with MySQL 5.7, would fail due to SSL verification errors against 5.7's self-signed certificates. The previous PR introduced a test for this scenario but omitted the necessary ssl-mode=PREFERRED configuration. This change adds ssl-mode=PREFERRED to the /etc/mysql/conf.d/lando.cnf file created by mysql-client-install.sh, ensuring proper SSL handling and allowing the related CI tests to pass.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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