chore: bump ecql for obfuscate sensitive data to avoid leakage

apps/emqx_bridge_cassandra/rebar.config

@@ -1,6 +1,6 @@
 %% -*- mode: erlang; -*-
 {erl_opts, [debug_info]}.
-{deps, [ {ecql, {git, "https://github.com/emqx/ecql.git", {tag, "v0.5.1"}}}
+{deps, [ {ecql, {git, "https://github.com/emqx/ecql.git", {tag, "v0.5.2"}}}
        , {emqx_connector, {path, "../../apps/emqx_connector"}}
        , {emqx_resource, {path, "../../apps/emqx_resource"}}
        , {emqx_bridge, {path, "../../apps/emqx_bridge"}}