chore: upgrade jmh dependency to 1.34 (#1685)

Author: thiagotnunes

google-cloud-spanner/pom.xml

@@ -313,13 +313,13 @@
     <dependency>
       <groupId>org.openjdk.jmh</groupId>
       <artifactId>jmh-core</artifactId>
-      <version>1.33</version>
+      <version>1.34</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.openjdk.jmh</groupId>
       <artifactId>jmh-generator-annprocess</artifactId>
-      <version>1.33</version>
+      <version>1.34</version>
       <scope>test</scope>
     </dependency>
   </dependencies>