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/using/venv-create.inc b/Doc/using/venv-create.inc
index 1ada83c..8fd107b 100644
--- a/Doc/using/venv-create.inc
+++ b/Doc/using/venv-create.inc
@@ -35,7 +35,7 @@
 The command, if run with ``-h``, will show the available options::
 
     usage: venv [-h] [--system-site-packages] [--symlinks | --copies] [--clear]
-                [--upgrade] [--without-pip] [--prompt PROMPT]
+                [--upgrade] [--without-pip] [--prompt PROMPT] [--upgrade-deps]
                 ENV_DIR [ENV_DIR ...]
 
     Creates virtual Python environments in one or more target directories.
@@ -60,10 +60,15 @@
                             environment (pip is bootstrapped by default)
       --prompt PROMPT       Provides an alternative prompt prefix for this
                             environment.
+      --upgrade-deps        Upgrade core dependencies: pip setuptools to the
+                            latest version in PyPI
 
     Once an environment has been created, you may wish to activate it, e.g. by
     sourcing an activate script in its bin directory.
 
+.. versionchanged:: 3.8
+   Add ``--upgrade-deps`` option to upgrade pip + setuptools to the latest on PyPI
+
 .. versionchanged:: 3.4
    Installs pip by default, added the ``--without-pip``  and ``--copies``
    options