[issue-5939] upgrade commons-compress to 1.21 (apache#5942)

Author: pjfanning

pom.xml

@@ -83,7 +83,7 @@
         <!-- Apache Commons versions -->
         <cs.codec.version>1.15</cs.codec.version>
         <cs.commons-collections.version>4.4</cs.commons-collections.version>
-        <cs.commons-compress.version>1.20</cs.commons-compress.version>
+        <cs.commons-compress.version>1.21</cs.commons-compress.version>
         <cs.commons-exec.version>1.3</cs.commons-exec.version>
         <cs.commons-fileupload.version>1.4</cs.commons-fileupload.version>
         <cs.commons-httpclient.version>3.1</cs.commons-httpclient.version>