downloads: upgrade CPython 3.8.14 -> 3.8.15

Author: indygreg

pythonbuild/downloads.py

@@ -35,10 +35,10 @@
         "license_file": "LICENSE.bzip2.txt",
     },
     "cpython-3.8": {
-        "url": "https://www.python.org/ftp/python/3.8.14/Python-3.8.14.tar.xz",
-        "size": 19031932,
-        "sha256": "5d77e278271ba803e9909a41a4f3baca006181c93ada682a5e5fe8dc4a24c5f3",
-        "version": "3.8.14",
+        "url": "https://www.python.org/ftp/python/3.8.15/Python-3.8.15.tar.xz",
+        "size": 19038408,
+        "sha256": "5114fc7918a2a5e20eb5aac696b30c36f412c6ef24b13f5c9eb9e056982d9550",
+        "version": "3.8.15",
         "licenses": ["Python-2.0", "CNRI-Python"],
         "license_file": "LICENSE.cpython.txt",
         "python_tag": "cp38",