Update sonic-utilities submodule with commits,

judyjoseph · judyjoseph · commit 5fe57934358b · 2021-09-19T08:57:30.000-07:00
a631f04 Add check_db_integrity script to setup.py (#1828) ddf6793 Implement script null_route_helper (#1737)
diff --git a/src/sonic-utilities b/src/sonic-utilities
@@ -1 +1 @@
-Subproject commit 31607537089daf95c31405dc3e223740d32b2a88
+Subproject commit a631f04b98e7ceafb08c254837cbe094178a09b8
