add version back in

Signed-off-by: Jay DeLuca <jaydeluca4@gmail.com>

Author: jaydeluca

prometheus-metrics-core/pom.xml

@@ -54,6 +54,7 @@
     <dependency>
       <groupId>org.awaitility</groupId>
       <artifactId>awaitility</artifactId>
+      <version>4.3.0</version>
       <scope>test</scope>
     </dependency>
   </dependencies>

prometheus-metrics-core/src/test/java/io/prometheus/metrics/core/metrics/TestUtil.java

@@ -9,9 +9,6 @@
 public class TestUtil {
 
   public static void assertExemplarEquals(Exemplar expected, Exemplar actual) {
-    assertThat(actual)
-        .as("Expected exemplar to be present (rate-limited sampler may not have accepted yet)")
-        .isNotNull();
     // ignore timestamp
     assertThat(actual.getValue()).isCloseTo(expected.getValue(), offset(0.00001));
     assertThat((Iterable<? extends Label>) actual.getLabels()).isEqualTo(expected.getLabels());