Fixed delay to be more reliable

Author: d-exclaimation

Tests/DataLoaderTests/DataLoaderAsyncTests.swift

@@ -89,7 +89,7 @@ final class DataLoaderAsyncTests: XCTestCase {
         async let value2 = identityLoader.load(key: 2, on: eventLoopGroup)
 
         /// Have to wait for a split second because Tasks may not be executed before this statement
-        try await Task.sleep(nanoseconds: 500_000)
+        try await Task.sleep(nanoseconds: 500_000_000)
 
         XCTAssertNoThrow(try identityLoader.execute())