Update Dockerfile

Dockerfile

@@ -4,8 +4,8 @@ ENV DEBIAN_FRONTEND=noninteractive \
 
 # Remove any third-party apt sources to avoid issues with expiring keys.
 # Install some basic utilities
-RUN apt-get install python
-RUN apt-get install python-pip
+RUN apt install python3
+RUN apt install python3-pip
 RUN rm -f /etc/apt/sources.list.d/*.list && \
     apt-get update && apt-get install -y --no-install-recommends \
     curl \