chore: upgrade to gen_rpc-3.4.0

gen_rpc 3.4.0 introduced {active,100} by default for acceptor socket.
which should pose some push-backs towards RPC caller nodes
when it's uner heavy load

apps/emqx/rebar.config

@@ -30,7 +30,7 @@
     {cowboy, {git, "https://github.com/emqx/cowboy", {tag, "2.9.2"}}},
     {esockd, {git, "https://github.com/emqx/esockd", {tag, "5.11.3"}}},
     {ekka, {git, "https://github.com/emqx/ekka", {tag, "0.19.5"}}},
-    {gen_rpc, {git, "https://github.com/emqx/gen_rpc", {tag, "3.3.1"}}},
+    {gen_rpc, {git, "https://github.com/emqx/gen_rpc", {tag, "3.4.0"}}},
     {hocon, {git, "https://github.com/emqx/hocon.git", {tag, "0.43.1"}}},
     {emqx_http_lib, {git, "https://github.com/emqx/emqx_http_lib.git", {tag, "0.5.3"}}},
     {pbkdf2, {git, "https://github.com/emqx/erlang-pbkdf2.git", {tag, "2.0.4"}}},

mix.exs

@@ -216,7 +216,7 @@ defmodule EMQXUmbrella.MixProject do
   # in conflict by emqx_connector and system_monitor
   def common_dep(:epgsql), do: {:epgsql, github: "emqx/epgsql", tag: "4.7.1.2", override: true}
   def common_dep(:esasl), do: {:esasl, github: "emqx/esasl", tag: "0.2.1"}
-  def common_dep(:gen_rpc), do: {:gen_rpc, github: "emqx/gen_rpc", tag: "3.3.1", override: true}
+  def common_dep(:gen_rpc), do: {:gen_rpc, github: "emqx/gen_rpc", tag: "3.4.0", override: true}
 
   def common_dep(:system_monitor),
     do: {:system_monitor, github: "ieQu1/system_monitor", tag: "3.0.5"}

rebar.config

@@ -85,7 +85,7 @@
     {esockd, {git, "https://github.com/emqx/esockd", {tag, "5.11.3"}}},
     {rocksdb, {git, "https://github.com/emqx/erlang-rocksdb", {tag, "1.8.0-emqx-6"}}},
     {ekka, {git, "https://github.com/emqx/ekka", {tag, "0.19.5"}}},
-    {gen_rpc, {git, "https://github.com/emqx/gen_rpc", {tag, "3.3.1"}}},
+    {gen_rpc, {git, "https://github.com/emqx/gen_rpc", {tag, "3.4.0"}}},
     {grpc, {git, "https://github.com/emqx/grpc-erl", {tag, "0.6.12"}}},
     {minirest, {git, "https://github.com/emqx/minirest", {tag, "1.4.3"}}},
     {ecpool, {git, "https://github.com/emqx/ecpool", {tag, "0.5.7"}}},