Bump commons-io from 2.4 to 2.7

Bumps commons-io from 2.4 to 2.7.

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -77,7 +77,7 @@
         <powermock.version>1.6.6</powermock.version>
         <jraft.version>1.3.5.Alpha1</jraft.version>
         <metrics.version>4.0.2</metrics.version>
-        <commons-io.version>2.4</commons-io.version>
+        <commons-io.version>2.7</commons-io.version>
         <jetty.version>9.4.19.v20190610</jetty.version>
         <rocksdbjni.version>6.4.6</rocksdbjni.version>
         <main.user.dir>${user.dir}</main.user.dir>