fix(redis): remove `required` meta from schema

Since there's a default value, this field shouldn't be marked as
required.

apps/emqx_connector/src/emqx_connector.app.src

@@ -1,7 +1,7 @@
 %% -*- mode: erlang -*-
 {application, emqx_connector, [
     {description, "EMQX Data Integration Connectors"},
-    {vsn, "0.1.17"},
+    {vsn, "0.1.18"},
     {registered, []},
     {mod, {emqx_connector_app, []}},
     {applications, [

apps/emqx_connector/src/emqx_connector_redis.erl

@@ -285,7 +285,6 @@ redis_fields() ->
         {database, #{
             type => integer(),
             default => 0,
-            required => true,
             desc => ?DESC("database")
         }},
         {auto_reconnect, fun emqx_connector_schema_lib:auto_reconnect/1}