Increase restart timeout (#1242)

### Description

Increase stream reconnect timeout and silence reconnect exception

### Context


### Testing

- `./gradlew test`


### Documentation



### Known limitations

build.gradle.kts

@@ -118,7 +118,7 @@ subprojects {
 
 allprojects {
   group = "org.stellar.anchor-sdk"
-  version = "1.2.20"
+  version = "1.2.21"
 
   tasks.jar {
     manifest {

platform/src/main/java/org/stellar/anchor/platform/payment/observer/stellar/StellarPaymentObserver.java

@@ -172,7 +172,8 @@ public void onFailure(
               java.util.Optional<Throwable> error, java.util.Optional<Integer> responseCode) {
             handleFailure(error);
           }
-        });
+        },
+        SILENCE_TIMEOUT * 1000);
   }
 
   private void updateReceivedMetrics(OperationResponse operationResponse) {
@@ -429,6 +430,12 @@ void handleEvent(OperationResponse operationResponse) {
   void handleFailure(Optional<Throwable> exception) {
     // The SSEStreamer has internal errors. We will give up and let the container
     // manager to restart.
+    if (exception.isPresent()
+        && exception.get() instanceof IOException
+        && exception.get().getMessage().contains("Canceled")) {
+      infoF("Restarting stream");
+      return;
+    }
     exception.ifPresent(throwable -> errorEx("stellar payment observer stream error: ", throwable));
     // Mark the observer unhealthy
     setStatus(STREAM_ERROR);