Update to 3.8.0rc1, pip 19.3

Author: docker-library-bot

3.8-rc/alpine3.10/Dockerfile

@@ -106,7 +106,7 @@ RUN cd /usr/local/bin \
 	&& ln -s python3-config python-config
 
 # if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
-ENV PYTHON_PIP_VERSION 19.2.3
+ENV PYTHON_PIP_VERSION 19.3
 # https://github.com/pypa/get-pip
 ENV PYTHON_GET_PIP_URL https://github.com/pypa/get-pip/raw/309a56c5fd94bd1134053a541cb4657a4e47e09d/get-pip.py
 ENV PYTHON_GET_PIP_SHA256 57e3643ff19f018f8a00dfaa6b7e4620e3c1a7a2171fd218425366ec006b3bfe

3.8-rc/buster/Dockerfile

@@ -67,7 +67,7 @@ RUN cd /usr/local/bin \
 	&& ln -s python3-config python-config
 
 # if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
-ENV PYTHON_PIP_VERSION 19.2.3
+ENV PYTHON_PIP_VERSION 19.3
 # https://github.com/pypa/get-pip
 ENV PYTHON_GET_PIP_URL https://github.com/pypa/get-pip/raw/309a56c5fd94bd1134053a541cb4657a4e47e09d/get-pip.py
 ENV PYTHON_GET_PIP_SHA256 57e3643ff19f018f8a00dfaa6b7e4620e3c1a7a2171fd218425366ec006b3bfe

3.8-rc/buster/slim/Dockerfile

@@ -102,7 +102,7 @@ RUN cd /usr/local/bin \
 	&& ln -s python3-config python-config
 
 # if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
-ENV PYTHON_PIP_VERSION 19.2.3
+ENV PYTHON_PIP_VERSION 19.3
 # https://github.com/pypa/get-pip
 ENV PYTHON_GET_PIP_URL https://github.com/pypa/get-pip/raw/309a56c5fd94bd1134053a541cb4657a4e47e09d/get-pip.py
 ENV PYTHON_GET_PIP_SHA256 57e3643ff19f018f8a00dfaa6b7e4620e3c1a7a2171fd218425366ec006b3bfe

3.8-rc/windows/windowsservercore-1803/Dockerfile

@@ -42,7 +42,7 @@ RUN $url = ('https://www.python.org/ftp/python/{0}/python-{1}-amd64.exe' -f $env
 	Write-Host 'Complete.'
 
 # if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
-ENV PYTHON_PIP_VERSION 19.2.3
+ENV PYTHON_PIP_VERSION 19.3
 # https://github.com/pypa/get-pip
 ENV PYTHON_GET_PIP_URL https://github.com/pypa/get-pip/raw/309a56c5fd94bd1134053a541cb4657a4e47e09d/get-pip.py
 ENV PYTHON_GET_PIP_SHA256 57e3643ff19f018f8a00dfaa6b7e4620e3c1a7a2171fd218425366ec006b3bfe

3.8-rc/windows/windowsservercore-1809/Dockerfile

@@ -42,7 +42,7 @@ RUN $url = ('https://www.python.org/ftp/python/{0}/python-{1}-amd64.exe' -f $env
 	Write-Host 'Complete.'
 
 # if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
-ENV PYTHON_PIP_VERSION 19.2.3
+ENV PYTHON_PIP_VERSION 19.3
 # https://github.com/pypa/get-pip
 ENV PYTHON_GET_PIP_URL https://github.com/pypa/get-pip/raw/309a56c5fd94bd1134053a541cb4657a4e47e09d/get-pip.py
 ENV PYTHON_GET_PIP_SHA256 57e3643ff19f018f8a00dfaa6b7e4620e3c1a7a2171fd218425366ec006b3bfe

3.8-rc/windows/windowsservercore-ltsc2016/Dockerfile

@@ -42,7 +42,7 @@ RUN $url = ('https://www.python.org/ftp/python/{0}/python-{1}-amd64.exe' -f $env
 	Write-Host 'Complete.'
 
 # if this is called "PIP_VERSION", pip explodes with "ValueError: invalid truth value '<VERSION>'"
-ENV PYTHON_PIP_VERSION 19.2.3
+ENV PYTHON_PIP_VERSION 19.3
 # https://github.com/pypa/get-pip
 ENV PYTHON_GET_PIP_URL https://github.com/pypa/get-pip/raw/309a56c5fd94bd1134053a541cb4657a4e47e09d/get-pip.py
 ENV PYTHON_GET_PIP_SHA256 57e3643ff19f018f8a00dfaa6b7e4620e3c1a7a2171fd218425366ec006b3bfe