Bump protocol to 0.5.1

Dockerfile

@@ -138,7 +138,7 @@ RUN cd /opt/ &&\
     rm -rf /opt/opencv-${OPENCV_VERSION} && rm -rf /opt/opencv_contrib-${OPENCV_VERSION} &&\
     ln -s /usr/local/include/opencv4/opencv2 /usr/local/include/opencv2
 
-ARG PROTOCOL_VERSION=0.4.5
+ARG PROTOCOL_VERSION=0.5.1
 
 # Beyond Protocol
 RUN wget https://gitlab.utu.fi/api/v4/projects/14965/packages/generic/libftl-protocol/${PROTOCOL_VERSION}/libftl-protocol${PROTOCOL_VERSION}-Linux.deb && \