Added test case to verify TLS 1.3 auto-negotiation support

[sharmagot]

This MR adds a new integration test to verify that the Vertica Python client correctly supports TLS 1.3 negotiation.

The test validates that the client can successfully connect using TLS 1.3 when supported by the server.

If the server only supports TLS 1.2, the connection should gracefully fall back to it.

The test also logs the negotiated TLS version for debugging and verification purposes.

[CLAassistant]

All committers have signed the CLA.

[sivaalamp]

Please address the comments

[sivaalamp]

The test case updates look good.
Since the TOTP-related changes have already been merged through a separate PR, they can be removed from this one.
Please also update the PR description to reflect these modifications accordingly.

[sharmagot]

The test case updates look good. Since the TOTP-related changes have already been merged through a separate PR, they can be removed from this one. Please also update the PR description to reflect these modifications accordingly.

Thanks, Siva. I’ve addressed this.
I’ve removed the TOTP-related changes from this MR and updated the PR description accordingly

[sivaalamp]

Changes now look good to me