Mention MySQL Connector version that needs to be used

[ashera96]

Description:
Under our documentation [1], we have provided a link to download the MysQL Java Connector. This link is redirecting users to the latest connector that is available for download. We need to specify the tested version that one should use instead (tested version is 8.0.33).

[1] https://apim.docs.wso2.com/en/latest/install-and-setup/setup/setting-up-databases/changing-default-databases/changing-to-mysql/#setting-up-the-drivers