Update Dockerfile.base

Author: hephaex

commons/Dockerfile.base

@@ -1,10 +1,10 @@
-FROM ubuntu:18.04
+FROM ubuntu:20.04
 
-ENV NUMPY_VERSION 1.18.5
-ENV SCIPY_VERSION 1.5.2
+ENV NUMPY_VERSION 1.21.3
+ENV SCIPY_VERSION 1.6.2
 
-# Python 2.7 or 3.6 is supported by Ubuntu Bionic out of the box
-ARG python=3.6
+# Python 3.8 is supported by Ubuntu 
+ARG python=3.8
 ENV PYTHON_VERSION=${python}
 
 ENV DEBIAN_FRONTEND=noninteractive \
@@ -25,9 +25,9 @@ RUN apt-get update -y && \
     apt-get install -y --no-install-recommends \
         build-essential \
         gcc g++ make \
-	automake \
-	gfortran \
-	gpg-agent \
+	    automake \
+	    gfortran \
+	    gpg-agent \
         wget zip unzip \
         software-properties-common