Disallowed Header in RPC request from stellar-sdk when using quicknode

[carlosdimatteo]

Describe the bug
Unable to use Quicknode rpc url with stellar-sdk in browser because it throws CORS error related to sdk including "X-Client-Version" headers in RPC requests

What version are you on?
11.3.0

To Reproduce
Steps to reproduce the behavior:

1. setup stellar-sdk with a quicknode rpc url in a Browser JS proj
2. try to execute any interaction for example

const rpc = new SorobanRpc.Server(url);
const data = await rpc.getLatestLedger();

3. CORS error will show up :

Access to XMLHttpRequest at URL from origin HOST has been blocked by CORS policy: Request header field x-client-version is not allowed by Access-Control-Allow-Headers in preflight 

Expected behavior
Usual RPC network requests to work without error

Additional context

• Did some debugging and reproducing the request with fetch() but removing X-Client-Version and X-Client-Name headers seemed to fix the issue
• This is likely an issue with the way Quicknode sets up their RPC server but putting it here first for better traceability
• headers are set here