Update to 3.9.0a2, pip 19.3.1

Author: docker-library-bot

3.9-rc/alpine3.10/Dockerfile

@@ -18,7 +18,7 @@ ENV LANG C.UTF-8
 RUN apk add --no-cache ca-certificates
 
 ENV GPG_KEY E3FF2839C048B25C084DEBE9B26995E310250568
-ENV PYTHON_VERSION 3.9.0a1
+ENV PYTHON_VERSION 3.9.0a2
 
 RUN set -ex \
 	&& apk add --no-cache --virtual .fetch-deps \

3.9-rc/buster/Dockerfile

@@ -20,7 +20,7 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
 	&& rm -rf /var/lib/apt/lists/*
 
 ENV GPG_KEY E3FF2839C048B25C084DEBE9B26995E310250568
-ENV PYTHON_VERSION 3.9.0a1
+ENV PYTHON_VERSION 3.9.0a2
 
 RUN set -ex \
 	\

3.9-rc/windows/windowsservercore-1809/Dockerfile

@@ -8,7 +8,7 @@ FROM mcr.microsoft.com/windows/servercore:1809
 
 SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';"]
 
-ENV PYTHON_VERSION 3.9.0a1
+ENV PYTHON_VERSION 3.9.0a2
 ENV PYTHON_RELEASE 3.9.0
 
 RUN $url = ('https://www.python.org/ftp/python/{0}/python-{1}-amd64.exe' -f $env:PYTHON_RELEASE, $env:PYTHON_VERSION); \

3.9-rc/windows/windowsservercore-ltsc2016/Dockerfile

@@ -8,7 +8,7 @@ FROM mcr.microsoft.com/windows/servercore:ltsc2016
 
 SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop'; $ProgressPreference = 'SilentlyContinue';"]
 
-ENV PYTHON_VERSION 3.9.0a1
+ENV PYTHON_VERSION 3.9.0a2
 ENV PYTHON_RELEASE 3.9.0
 
 RUN $url = ('https://www.python.org/ftp/python/{0}/python-{1}-amd64.exe' -f $env:PYTHON_RELEASE, $env:PYTHON_VERSION); \