Bump commons-io from 2.6 to 2.7 in /gwt-xhr-test-service (#23)

Bumps commons-io from 2.6 to 2.7.

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Author: dependabot[bot]

gwt-xhr-test-service/pom.xml

@@ -23,7 +23,7 @@
     <dependency>
       <groupId>commons-io</groupId>
       <artifactId>commons-io</artifactId>
-      <version>2.6</version>
+      <version>2.7</version>
     </dependency>
   </dependencies>