Enable SSL certificate verification for PlayFab API requests

[rgomez391]

Summary

Enables TLS certificate verification for all PlayFab API requests in the C++ GSDK.

Previously, CURLOPT_SSL_VERIFYPEER was set to false in PlayFabHttp.cpp, disabling SSL certificate verification for every PlayFab API call. This exposed the developer's secret API key and all API traffic to man-in-the-middle (MITM) interception. The disabling was a temporary workaround (// TODO: Replace this with a ca-bundle ref???) that was never resolved.

Fix

Set CURLOPT_SSL_VERIFYPEER to true, matching the resolution already shipped in the sibling SDK PlayFab/XPlatCppSdk. CURLOPT_SSL_VERIFYHOST remains at its secure default (2).

Testing

• Configured and built the C++ GSDK with CMake (VS 2022 / MSVC) — compiles cleanly, no new warnings or errors.

Notes

• After this change, debugging proxies like Fiddler will no longer transparently intercept these calls unless their root cert is trusted by the system — this is the intended, secure behavior.

Resolves AB#62661974

[tculotta]