Upgrade to EasyMock 5.4.0

This resolves a JDK 21 compatibility issue:

java.lang.IllegalArgumentException: Could not create type
...
Caused by: java.lang.IllegalArgumentException: org.jclouds.blobstore.strategy.internal.DeleteAllKeysInList$$$EasyMock$6 must be defined in the same package as org.easymock.internal.ClassProxyFactory

Author: gaul

project/pom.xml

@@ -404,7 +404,7 @@
       <dependency>
         <groupId>org.easymock</groupId>
         <artifactId>easymock</artifactId>
-        <version>5.1.0</version>
+        <version>5.4.0</version>
       </dependency>
       <dependency>
         <groupId>com.squareup.okhttp3</groupId>