fix(postgres-cdc): disable certificate verification for prefer and require

[StrikeW]

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What's changed and what's your intention?

A quick solution to #16316

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[kwannoel]

Need cherry-pick to 1.8?

[StrikeW]

Need cherry-pick to 1.8?

Didn't evaluate the effectiveness yet, I think there is only one user waiting for this patch. IMO we can proceed the 1.8.1 release without waiting for this one, WDUT? @zwang28