message: fix platformio version to 4.3.4 in CI
diff: @@ -4,7 +4,7 @@ FROM debian:buster
  RUN apt-get update && apt-get install build-essential python-pip lcov git curl libtinfo5 -y \
  && pip install -U pip \
  - && pip install platformio codecov \
  + && pip install platformio==4.3.4 codecov \
  && platformio update
  WORKDIR /root/Ventilator
  