Bump commons-io from 2.6 to 2.7 in /system-test (#877)

Bumps commons-io from 2.6 to 2.7.

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Author: dependabot[bot]

system-test/pom.xml

@@ -34,7 +34,7 @@
         <dependency>
             <groupId>commons-io</groupId>
             <artifactId>commons-io</artifactId>
-            <version>2.6</version>
+            <version>2.7</version>
             <scope>test</scope>
         </dependency>
     </dependencies>