Remove empty line at the end of EndpointContextTest.java

Author: blakeli0

sdk-platform-java/gax-java/gax/src/test/java/com/google/api/gax/rpc/EndpointContextTest.java

@@ -683,5 +683,4 @@ void endpointContextBuild_resolvesPort() throws IOException {
             .build();
     Truth.assertThat(endpointContext.resolvedServerPort()).isNull();
   }
-
 }