downloads: upgrade CPython from 3.9.3 to 3.9.4

Author: indygreg

pythonbuild/downloads.py

@@ -62,10 +62,10 @@
         "python_tag": "cp38",
     },
     "cpython-3.9": {
-        "url": "https://www.python.org/ftp/python/3.9.3/Python-3.9.3.tar.xz",
-        "size": 18899676,
-        "sha256": "30811039c65e04c14fc698e423947e464f9316e69fb44610bd38446046bb82b5",
-        "version": "3.9.3",
+        "url": "https://www.python.org/ftp/python/3.9.4/Python-3.9.4.tar.xz",
+        "size": 18900304,
+        "sha256": "4b0e6644a76f8df864ae24ac500a51bbf68bd098f6a173e27d3b61cdca9aa134",
+        "version": "3.9.4",
         "licenses": ["Python-2.0", "CNRI-Python"],
         "license_file": "LICENSE.cpython.txt",
         "python_tag": "cp39",