erlang/otp 21.1, cowboy 2.5.0 (#4166)

frameworks/Erlang/cowboy/cowboy.dockerfile

@@ -1,4 +1,4 @@
-FROM erlang:20.3.8.4
+FROM erlang:21.1.1
 
 ADD ./ /cowboy
 WORKDIR /cowboy

frameworks/Erlang/cowboy/rebar.config

@@ -3,5 +3,5 @@
   {jiffy, ".*", {git, "https://github.com/davisp/jiffy.git", {tag, "0.15.2"}}},
   {mimetypes, ".*", {git, "http://github.com/spawngrid/mimetypes.git", {branch, master}}},
   {emysql, ".*", {git, "https://github.com/deadtrickster/Emysql.git", "52b802098322aad372198b9f5fa9ae9a4c758ad1"}},
-  {cowboy, ".*", {git, "https://github.com/ninenines/cowboy.git", {tag, "2.4.0"}}}
+  {cowboy, ".*", {git, "https://github.com/ninenines/cowboy.git", {tag, "2.5.0"}}}
  ]}.