sync: Fix print statement in _PostRepoFetch

R=jasonnc@google.com

Bug: b/303806829
Change-Id: I49075bfb55b842610786e61a0dedfe008cd1296a
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/388614
Commit-Queue: Aravind Vasudevan <aravindvasudev@google.com>
Reviewed-by: Jason Chang <jasonnc@google.com>
Tested-by: Aravind Vasudevan <aravindvasudev@google.com>
diff --git a/subcmds/sync.py b/subcmds/sync.py
index 87d3cd8..85428b1 100644
--- a/subcmds/sync.py
+++ b/subcmds/sync.py
@@ -1905,7 +1905,7 @@
             logger.warning("warning: Skipped upgrade to unverified version")
     else:
         if verbose:
-            print("repo version %s is current", rp.work_git.describe(HEAD))
+            print("repo version %s is current" % rp.work_git.describe(HEAD))
 
 
 class _FetchTimes(object):