Deprecated HTTP Client method called

```
[WARNING] system modules path not set in conjunction with -source 17
[WARNING] {{workspace}}/otp-java-client/src/main/java/org/opentripplanner/client/OtpApiClient.java:[185,30] execute(org.apache.hc.core5.http.ClassicHttpRequest) in org.apache.hc.client5.http.impl.classic.CloseableHttpClient has been deprecated
```