chore: upgrade dashboard to v1.6.1 for ce

Makefile

@@ -20,7 +20,7 @@ endif
 
 # Dashboard version
 # from https://github.com/emqx/emqx-dashboard5
-export EMQX_DASHBOARD_VERSION ?= v1.6.0
+export EMQX_DASHBOARD_VERSION ?= v1.6.1
 export EMQX_EE_DASHBOARD_VERSION ?= e1.4.1
 
 PROFILE ?= emqx