harlequin: remove mysql dependency

[cho-m]

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[iMichka]

Hey. I'm OK with the change, can you just give a little bit more context?

[cho-m]

The Python library doesn't need C library,
https://github.com/mysql/mysql-connector-python/blob/8.4.0/mysql-connector-python/setup.py#L91-L92

MySQL driver written in Python which does not depend on MySQL C client
libraries and implements the DB API v2.0 specification (PEP-249).

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Also, mysql (full DB installation) should rarely be used as dependency.

If C libraries are needed, then we would want mariadb-connector-c or mysql-client. Same reason we usually use libpq rather than postgresql@* dependency.

[iMichka]

LGTM