chore: pin lc version 0.3.0

lc 0.3.0 has new APIs added to get total RAM and usage ratio

apps/emqx/rebar.config

@@ -22,7 +22,7 @@
 %% This rebar.config is necessary because the app may be used as a
 %% `git_subdir` dependency in other projects.
 {deps, [
-    {lc, {git, "https://github.com/emqx/lc.git", {tag, "0.2.1"}}},
+    {lc, {git, "https://github.com/emqx/lc.git", {tag, "0.3.0"}}},
     {gproc, {git, "https://github.com/uwiger/gproc", {tag, "0.8.0"}}},
     {jiffy, {git, "https://github.com/emqx/jiffy", {tag, "1.0.5"}}},
     {cowboy, {git, "https://github.com/emqx/cowboy", {tag, "2.9.0"}}},

mix.exs

@@ -46,7 +46,7 @@ defmodule EMQXUmbrella.MixProject do
     # we need several overrides here because dependencies specify
     # other exact versions, and not ranges.
     [
-      {:lc, github: "emqx/lc", tag: "0.2.1"},
+      {:lc, github: "emqx/lc", tag: "0.3.0"},
       {:redbug, "2.0.7"},
       {:typerefl, github: "ieQu1/typerefl", tag: "0.9.1", override: true},
       {:ehttpc, github: "emqx/ehttpc", tag: "0.2.0"},

rebar.config

@@ -44,7 +44,7 @@
 {post_hooks,[]}.
 
 {deps,
-    [ {lc, {git, "https://github.com/emqx/lc.git", {tag, "0.2.1"}}}
+    [ {lc, {git, "https://github.com/emqx/lc.git", {tag, "0.3.0"}}}
     , {redbug, "2.0.7"}
     , {gpb, "4.11.2"} %% gpb only used to build, but not for release, pin it here to avoid fetching a wrong version due to rebar plugins scattered in all the deps
     , {typerefl, {git, "https://github.com/ieQu1/typerefl", {tag, "0.9.1"}}}