chore: upgrade to sasl_auth 2.1.1

apps/emqx_auth_kerberos/rebar.config

@@ -3,5 +3,5 @@
 {deps, [
     {emqx, {path, "../emqx"}},
     {emqx_utils, {path, "../emqx_utils"}},
-    {sasl_auth, {git, "https://github.com/kafka4beam/sasl_auth.git", {tag, "v2.1.0"}}}
+    {sasl_auth, {git, "https://github.com/kafka4beam/sasl_auth.git", {tag, "v2.1.1"}}}
 ]}.

apps/emqx_bridge_kafka/rebar.config

@@ -10,7 +10,7 @@
     {emqx_connector, {path, "../../apps/emqx_connector"}},
     {emqx_resource, {path, "../../apps/emqx_resource"}},
     {emqx_bridge, {path, "../../apps/emqx_bridge"}},
-    {sasl_auth, {git, "https://github.com/kafka4beam/sasl_auth.git", {tag, "v2.1.0"}}}
+    {sasl_auth, {git, "https://github.com/kafka4beam/sasl_auth.git", {tag, "v2.1.1"}}}
 ]}.
 
 {shell, [