retry: deflake TestRetryWithMaxDurationAndMaxRetries

Previously, the time bound for the retry test was quite small. So an
overloaded or slow test runner may hit the timeout before the goroutine
was scheduled for max retries.

Fixes: #154160
Release note: none

Author: jeffswenson

pkg/util/retry/retry_test.go

@@ -566,7 +566,7 @@ func TestRetryWithMaxDurationAndMaxRetries(t *testing.T) {
 			InitialBackoff: time.Millisecond,
 			MaxBackoff:     time.Millisecond * 20,
 			Multiplier:     2,
-			MaxDuration:    time.Millisecond * 50,
+			MaxDuration:    time.Second,
 			MaxRetries:     3,
 		}