automation: install Python 3.8.0

Python 3.8 has been released. Let's install it instead of the
RC / development version.

Differential Revision: https://phab.mercurial-scm.org/D7114

contrib/automation/hgautomation/linux.py

@@ -26,11 +26,11 b' DISTROS = {'
 
 INSTALL_PYTHONS = r'''
 PYENV2_VERSIONS="2.7.16 pypy2.7-7.1.1"
-PYENV3_VERSIONS="3.5.7 3.6.9 3.7.4 3.8-dev pypy3.5-7.0.0 pypy3.6-7.1.1"
+PYENV3_VERSIONS="3.5.7 3.6.9 3.7.4 3.8.0 pypy3.5-7.0.0 pypy3.6-7.1.1"
 
 git clone https://github.com/pyenv/pyenv.git /hgdev/pyenv
 pushd /hgdev/pyenv
-git checkout 17f44b7cd6f58ea2fa68ec0371fb9e7a826b8be2
+git checkout d6d6bc8bb08bcdcbf4eb79509aa7061011ade1c4
 popd
 
 export PYENV_ROOT="/hgdev/pyenv"

contrib/install-windows-dependencies.ps1

@@ -42,10 +42,10 b''
 $PYTHON37_X64_URL = "https://www.python.org/ftp/python/3.7.4/python-3.7.4-amd64.exe"
 $PYTHON37_x64_SHA256 = "bab92f987320975c7826171a072bfd64f8f0941aaf2cdeba6924b7025c9968a3"
 
-$PYTHON38_x86_URL = "https://www.python.org/ftp/python/3.8.0/python-3.8.0rc1.exe"
-$PYTHON38_x86_SHA256 = "79eb5dd04be8384154ef6767e35ae570ede28188bd6cecce4f18c1aa42d1bb66"
-$PYTHON38_x64_URL = "https://www.python.org/ftp/python/3.8.0/python-3.8.0rc1-amd64.exe"
-$PYTHON38_x64_SHA256 = "c9cffbaf11487c08432d3ea9a3ac125f0fee41b41e71062477fb057ca1e5ab40"
+$PYTHON38_x86_URL = "https://www.python.org/ftp/python/3.8.0/python-3.8.0.exe"
+$PYTHON38_x86_SHA256 = "b471908de5e10d8fb5c3351a5affb1172da7790c533e0c9ffbaeec9c11611b15"
+$PYTHON38_x64_URL = "https://www.python.org/ftp/python/3.8.0/python-3.8.0-amd64.exe"
+$PYTHON38_x64_SHA256 = "a9bbc6088a3e4c7112826e21bfee6277f7b6d93259f7c57176139231bb7071e4"
 
 # PIP 19.2.3.
 $PIP_URL = "https://github.com/pypa/get-pip/raw/309a56c5fd94bd1134053a541cb4657a4e47e09d/get-pip.py"