fix crash due to invalid map key

Author: lukaszsamson

apps/language_server/lib/language_server/parser.ex

@@ -315,7 +315,7 @@ defmodule ElixirLS.LanguageServer.Parser do
       if updated_by_ref == %{} do
         updated_parse_pids
       else
-        Map.put(updated_parse_pids, ref, updated_by_ref)
+        Map.put(updated_parse_pids, {uri, version}, updated_by_ref)
       end
 
     if reason != :normal and from != nil do