mutliqc: Dockerfile switch from debian to python img

src/.docker_modules/multiqc/1.11/Dockerfile

-FROM debian:stretch
+FROM python:3.9-slim
 MAINTAINER Laurent Modolo
 
 ENV MULTIQC_VERSION=1.11
-ENV PACKAGES build-essential \
-             python3-pip \
-             python3-setuptools \
-             python3-dev \
-             python3-wheel \
-             procps \
-             locales
+ENV PACKAGES procps locales
 
 RUN apt-get update && \
     apt-get install -y --no-install-recommends ${PACKAGES} && \