bpo-38928: Fix versionadded for venv's upgrade_deps function (GH-17404)

diff --git a/Doc/library/venv.rst b/Doc/library/venv.rst
index b29fb3e..5494c0c 100644
--- a/Doc/library/venv.rst
+++ b/Doc/library/venv.rst
@@ -132,7 +132,7 @@
     .. versionadded:: 3.6
        Added the ``prompt`` parameter
 
-    .. versionadded:: 3.8
+    .. versionadded:: 3.9
        Added the ``upgrade_deps`` parameter
 
     Creators of third-party virtual environment tools will be free to use the
@@ -197,7 +197,7 @@
        ``setuptools``) in the environment. This is done by shelling out to the
        ``pip`` executable in the environment.
 
-       .. versionadded:: 3.8
+       .. versionadded:: 3.9
 
     .. method:: post_setup(context)