Updated mysql and disabled default features

[TobiasDeBruijn]

Changes

• Bumped mysql to v22.0.0
• Disabled default features on mysql
• Added flate2 crate with zlib feature, This previously came in via the mysql crate but now it no longer is, so it must be specified by us

Reasoning

MySQL default ships with native-tls, i.e. OpenSSL enabled by default. My PR to the mysql crate makes this optional but keeps OpenSSL enabled by default. However, when using refinery it is still pulled in, even if it is not enabled in my binary crate due to the way Cargo resolves features.

This PR makes mysql features optional, allowing the end user to choose if they want native-tls, or rustls e.g. By default mysql also came with the feature flate2/zlib, with disabled default features flate2/zlib is no longer included. When using refinery with only the mysql feature enabled it compiles fine. However, with the default feature set it no longer does (cargo b fails with too many errors to count).

Backwards compatibility

Backwards compatibility is maintained as the OpenSSL feature is still enabled by default via the mysql crate.

Thanks

[jxs]

Hi, and thanks for your interest! This seems legit, but can we make it so that flate2 is only imported when the mysql feature is enabled (like we do with mysql_async, tiberius, tokio-postgres) and leave a comment above stating the purpose?
thanks

[TobiasDeBruijn]

Good point to also allow 21.0.0, that does not break backwards compatibility either (with regards to OpenSSL) as the mysql crate shipped it irregardless of if you use default features or not.

[jxs]

yeah, sorry for the spam fixing the typos also.
Thanks!