Bump ehcache from 2.10.6 to 2.10.9.2 (#1889)

Bumps ehcache from 2.10.6 to 2.10.9.2.

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metrics-ehcache/pom.xml

@@ -17,7 +17,7 @@
 
     <properties>
         <javaModuleName>com.codahale.metrics.ehcache</javaModuleName>
-        <ehcache2.version>2.10.6</ehcache2.version>
+        <ehcache2.version>2.10.9.2</ehcache2.version>
     </properties>
 
     <dependencyManagement>