change log level from error to warn

Signed-off-by: Giovanni Liva <giovanni.liva@dynatrace.com>

providers/flagd/src/main/java/dev/openfeature/contrib/providers/flagd/resolver/grpc/EventStreamObserver.java

@@ -54,7 +54,7 @@ public void onNext(EventStreamResponse value) {
 
     @Override
     public void onError(Throwable t) {
-        log.error("event stream", t);
+        log.warn("event stream", t);
         if (this.cache.getEnabled()) {
             this.cache.clear();
         }