Update Dockerfile

Dockerfile

 FROM netboxcommunity/netbox
 ENV NAPALM_USERNAME netbox-napalm
 
-RUN python3 -m pip install pip==19.3.1
+#RUN python3 -m pip install pip==19.3.1
 RUN apk add git zlib && pip3 install --upgrade napalm cffi napalm-dellos10 
 RUN apk add py3-pillow
 RUN apk add netbox-qrcode