deps: update dependency org.openjdk.jmh:jmh-generator-annprocess to v1.25 (#376)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| org.openjdk.jmh:jmh-generator-annprocess | minor | `1.23` -> `1.25` |

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google-cloud-spanner/pom.xml

@@ -312,7 +312,7 @@
     <dependency>
       <groupId>org.openjdk.jmh</groupId>
       <artifactId>jmh-generator-annprocess</artifactId>
-      <version>1.23</version>
+      <version>1.25</version>
       <scope>test</scope>
     </dependency>
   </dependencies>