Shorten expired-invoice wait from 5s to 2s

The 1-second invoice has already expired by the time we need it expired;
sleeping 5x as long doesn't add safety, just CI time.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: benthecarman

orange-sdk/tests/integration_tests.rs

@@ -1482,8 +1482,8 @@ async fn test_payment_with_expired_invoice() {
 		let invoice =
 			third_party.bolt11_payment().receive(payment_amount.milli_sats(), &desc, 1).unwrap(); // 1 second expiry
 
-		// Wait longer to ensure invoice expires
-		tokio::time::sleep(Duration::from_secs(5)).await;
+		// Wait long enough to ensure the 1s-expiry invoice has expired.
+		tokio::time::sleep(Duration::from_secs(2)).await;
 
 		// Try to parse and pay the expired invoice - it should either fail to parse or fail to pay
 		let parse_result = wallet.parse_payment_instructions(invoice.to_string().as_str()).await;