Close response body of http connection

[pfeuffer]

Closing the body is necessary in okhttp, because the body is
backed by the socket. Without this, we get exceptions like
the following:

Apr 12, 2024 1:08:10 AM WARNING okhttp3.internal.platform.Platform log
A connection to https://atlas002.cloud.itz.in.bund.de/ was leaked. Did you forget to close a response body?
java.lang.Throwable: response.body().close()
at okhttp3.internal.platform.Platform.getStackTraceForCloseable(Platform.kt:145)
at okhttp3.internal.connection.RealCall.callStart(RealCall.kt:170)
at okhttp3.internal.connection.RealCall.enqueue(RealCall.kt:163)
at com.cloudogu.scmmanager.scm.api.ApiClient.execute(ApiClient.java:38)
at com.cloudogu.scmmanager.scm.api.HttpApiClient.get(HttpApiClient.java:60)
at com.cloudogu.scmmanager.scm.api.ScmManagerApi.getFileObject(ScmManagerApi.java:217)