bpo-34556: Add --upgrade-deps to venv module (#13100)

Add --upgrade-deps to venv module
- This allows for pip + setuptools to be automatically upgraded to the latest version on PyPI
- Update documentation to represent this change

bpo-34556: Add --upgrade to venv module
diff --git a/Doc/library/venv.rst b/Doc/library/venv.rst
index 4f083a3..d3d5ae2 100644
--- a/Doc/library/venv.rst
+++ b/Doc/library/venv.rst
@@ -97,7 +97,7 @@
 
 .. class:: EnvBuilder(system_site_packages=False, clear=False, \
                       symlinks=False, upgrade=False, with_pip=False, \
-                      prompt=None)
+                      prompt=None, upgrade_deps=False)
 
     The :class:`EnvBuilder` class accepts the following keyword arguments on
     instantiation:
@@ -123,12 +123,17 @@
       (defaults to ``None`` which means directory name of the environment would
       be used).
 
+    * ``upgrade_deps`` -- Update the base venv modules to the latest on PyPI
+
     .. versionchanged:: 3.4
        Added the ``with_pip`` parameter
 
     .. versionadded:: 3.6
        Added the ``prompt`` parameter
 
+    .. versionadded:: 3.8
+       Added the ``upgrade_deps`` parameter
+
     Creators of third-party virtual environment tools will be free to use the
     provided ``EnvBuilder`` class as a base class.