deps: update dependency org.openjdk.jmh:jmh-core to v1.30 (#1137)

Author: renovate-bot

google-cloud-spanner/pom.xml

@@ -305,7 +305,7 @@
     <dependency>
       <groupId>org.openjdk.jmh</groupId>
       <artifactId>jmh-core</artifactId>
-      <version>1.29</version>
+      <version>1.30</version>
       <scope>test</scope>
     </dependency>
     <dependency>