Allow for CI to pass on OTP 27 once it's released

Work around failure to compile `rebar_raw_resource` on OTP 27.0-rc1:
* alertlogic/rebar_raw_resource#9

Author: g-andrade

rebar.config

@@ -90,7 +90,9 @@
             {maxmind_test_data, {raw, {git, "https://github.com/maxmind/MaxMind-DB.git", {ref, "450fcf6"}}}}
         ]},
         {plugins, [
-            {rebar_raw_resource, "0.10.0"}
+            % FIXME go back to non-fork once it can compile on OTP 27:
+            % * https://github.com/alertlogic/rebar_raw_resource/pull/9
+            {rebar_raw_resource, {git, "https://github.com/g-andrade/rebar_raw_resource.git", {ref, "21ac9b6"}}}
         ]},
         {cover_enabled, true},
         {cover_opts, [verbose]}