Reduce sleep time in ObCrankerApplication thread

The Thread.sleep time in ObCrankerApplication.java has been halved from 500 milliseconds to 250 milliseconds. This improves the application's response time by allowing it to process events more frequently.

src/main/java/markets/arcana/obcranker/ObCrankerApplication.java

@@ -91,7 +91,7 @@ public void crankEventHeapLoop() {
                         log.info("No events found to consume.");
                     }
                     try {
-                        Thread.sleep(500);
+                        Thread.sleep(250);
                     } catch (InterruptedException e) {
                         log.error("Error consuming: {}", e.getMessage());
                     }