SOLR-6578: Update commons-io dependency to the latest 2.4 version (merged trunk r1633718)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1633719 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6578: added CHANGES.txt entry (merged trunk r1633721)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1633722 13f79535-47bb-0310-9956-ffa450edef68