Increase sleep time to avoid exemplar sampling rate limiting for open…

…MetricsScrapeWithExemplars() (#5908)

Signed-off-by: Johnny Lim <[email protected]>

implementations/micrometer-registry-prometheus/src/test/java/io/micrometer/prometheusmetrics/PrometheusMeterRegistryTest.java

@@ -943,7 +943,7 @@ void openMetricsScrapeWithExemplars() throws InterruptedException {
     }
 
     private static void sleepToAvoidRateLimiting() throws InterruptedException {
-        Thread.sleep(10); // sleeping since the sample interval limit is 1ms
+        Thread.sleep(100); // sleeping since the sample interval limit is 1ms
     }
 
     @Test