Wrong header used

[igor-ramazanov]

Hi, there's a small and non-critical bug:

https://github.com/VictorFrWu/bybit-java-api/blob/1dc9fe55219c5afa7e70a273b9dc8940e8dcf23f/src/main/java/com/bybit/api/client/constant/BybitApiConstants.java#L45

And

https://github.com/VictorFrWu/bybit-java-api/blob/1dc9fe55219c5afa7e70a273b9dc8940e8dcf23f/src/main/java/com/bybit/api/client/security/AuthenticationInterceptor.java#L67

The CONNECTION_HEADER should be "Connection":, and not "User-Agent".