!16 Upgrade package to version 20.4.2 for OpenStack Wallaby support

From: @sean-lau
Reviewed-by: @huangtianhua,@small_leek
Signed-off-by: @small_leek

python-virtualenv.spec

@@ -1,11 +1,11 @@
 %global srcname virtualenv
 Name:           python-%{srcname}
-Version:        20.3.0
-Release:        2
+Version:        20.4.2
+Release:        1
 Summary:        A tool to create isolated Python environments
 License:        MIT
 URL:            http://pypi.python.org/pypi/virtualenv
-Source0:        %{pypi_source}
+Source0:        https://files.pythonhosted.org/packages/79/64/203241c2e2b5abfd5edca4e28242c21bf8a9e84490873e4a8a155a9658fc/virtualenv-20.4.2.tar.gz
 
 BuildArch:      noarch
 BuildRequires:  python3-appdirs python3-distlib python3-filelock python3-six
@@ -68,6 +68,9 @@ Tools that support for python2.6 virtual environments with python3.
 %{python3_sitelib}/virtualenv/seed/wheels/embed/*.whl
 
 %changelog
+* Thu Aug 05 2021 liusheng <liusheng2048@gmail.com> - 20.4.2-1
+- Upgrade to version 20.4.2
+
 * Wed Apr 28 2021 shixuantong<shixuantong@huawei.com> - 20.3.0-2
 - add requires python3-appdirs python3-distlib python3-filelock