fix(java): replace excludedGroup with exclude (#720)

Author: mpeddada1

pom.xml

@@ -221,7 +221,7 @@
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-plugin</artifactId>
         <configuration>
-          <excludedGroups>com.google.cloud.spanner.IntegrationTest</excludedGroups>
+          <exclude>com.google.cloud.spanner.IntegrationTest</exclude>
           <reportNameSuffix>sponge_log</reportNameSuffix>
         </configuration>
       </plugin>