deps: update dependency org.easymock:easymock to v5.5.0 (googleapis#1639)

Co-authored-by: Cindy Peng <[email protected]>

Author: renovate-bot

pom.xml

@@ -110,7 +110,7 @@
       <dependency>
         <groupId>org.easymock</groupId>
         <artifactId>easymock</artifactId>
-        <version>5.2.0</version>
+        <version>5.5.0</version>
         <exclusions>
           <exclusion>
             <groupId>org.objenesis</groupId>