WIP try elixir instead of elixir-lang ???

.github/workflows/action.yml

@@ -17,7 +17,7 @@ jobs:
         run: |
           sudo add-apt-repository ppa:rabbitmq/rabbitmq-erlang
           sudo apt update
-          sudo apt install -y --allow-downgrades erlang elixir-lang
+          sudo apt install -y --allow-downgrades erlang elixir
       - name: Run tests
         run: |
           make current_rmq_ref=${{ matrix.rmqref }}