update rsync

wdl/utils/GcpUtils.wdl

@@ -11,7 +11,7 @@ task GcloudRsync {
         # Note that this is a Python regular expression, not a pure wildcard pattern. For example,
         # matching a string ending in "abc" is .*abc$ rather than *abc. Also note that the exclude path is relative,
         # as opposed to absolute (similar to Linux rsync and tar exclude options).
-        gcloud storage rsync --recursive ${source} ${destination} ${"--exclude=" + exclude_regex}
+        gcloud storage rsync --recursive ${source} ${destination} ~{"--exclude= " + exclude_regex}
     >>>
 
     runtime {