Flagsmith-Java-Client for Jakarta

Hello Team,

We would like to use the Flagsmith-java-client via Spring Boot 3.3.1, which is based on Java 17 and Jakarta.

Some of the imports in Flagsmith-java-client use Javax. which is not compatible with Jakarta. The program that is affected is FlagsmithConfig.class for two imports.

```
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.X509TrustManager;
```
The Method & Variable are:
```
private SSLSocketFactory sslSocketFactory;
private X509TrustManager trustManager;

public Builder sslSocketFactory(SSLSocketFactory sslSocketFactory, X509TrustManager trustManager) {
this.sslSocketFactory = sslSocketFactory;
this.trustManager = trustManager;
return this;
}
```

We'd like to ask you to release a new Flagsmith-Java-Client-Jakarta version for implementation; as an alternative, we can override the methods.