Update for OR-3.4 - rebar3 -> 3.21

Author: martinsumner

rebar.config

@@ -14,8 +14,9 @@
 
 {profiles,
  [{test,
-   [{deps, [meck,
-            {ibrowse, {git, "https://github.com/OpenRiak/ibrowse.git", {branch, "openriak-3.2"}}}
+   [{deps, [
+    {meck, {git, "https://github.com/OpenRiak/meck.git", {branch, "openriak-3.4"}}},
+    {ibrowse, {git, "https://github.com/OpenRiak/ibrowse.git", {branch, "openriak-3.4"}}}
            ]},
     {erl_opts, [debug_info]}
    ]}