Bump commons-io:commons-io from 2.11 to 2.15

A more aggressive bump than
#196

Also tests will run against this because it's a branch on
the main repo

pom.xml

@@ -104,7 +104,7 @@
     <dependency>
       <groupId>commons-io</groupId>
       <artifactId>commons-io</artifactId>
-      <version>2.11.0</version>
+      <version>2.15.0</version>
     </dependency>
     <dependency>
       <groupId>com.google.cloud</groupId>