fix: mysql module read_replica add missing ssl_mode in ip_configuration

[strimpak]

While using this module and mysql submodule, I noticed when I added ssl_mode for both my primary and replicas instances, in plan it was only changing primary. Could you please consider review this fix and merge it?

[google-cla[bot]]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[strimpak]

@imrannayer , @isaurabhuttam could you please review this one?

[imrannayer]

/gcbrun