[submodule] Update submodule linkmgrd to the latest HEAD automatically

mssonicbld · mssonicbld · commit 967c198a4484 · 2023-04-30T16:32:27.000+08:00
diff --git a/src/linkmgrd b/src/linkmgrd
@@ -1 +1 @@
-Subproject commit 557f3913b0126dea9180628f7eb278f354ad6939
+Subproject commit 71a3b1976992987127713640f6523045b775e0a4
