[gp_stats_collector] Restore erroneously deleted line

Author: NJrslv

pom.xml

@@ -153,6 +153,8 @@ code or new licensing patterns.
             <exclude>gpcontrib/gp_exttable_fdw/data/**</exclude>
             <exclude>gpcontrib/gp_exttable_fdw/gp_exttable_fdw.control</exclude>
 
+            <exclude>gpcontrib/diskquota/**</exclude>
+
             <exclude>getversion</exclude>
             <exclude>.git-blame-ignore-revs</exclude>
             <exclude>.dir-locals.el</exclude>