Bump CPython 3.13 version to 3.13.6

Author: zanieb

pythonbuild/downloads.py

@@ -73,10 +73,10 @@
         "python_tag": "cp312",
     },
     "cpython-3.13": {
-        "url": "https://www.python.org/ftp/python/3.13.5/Python-3.13.5.tar.xz",
-        "size": 22856016,
-        "sha256": "93e583f243454e6e9e4588ca2c2662206ad961659863277afcdb96801647d640",
-        "version": "3.13.5",
+        "url": "https://www.python.org/ftp/python/3.13.6/Python-3.13.6.tar.xz",
+        "size": 22761268,
+        "sha256": "17ba5508819d8736a14fbfc47d36e184946a877851b2e9c4b6c43acb44a3b104",
+        "version": "3.13.6",
         "licenses": ["Python-2.0", "CNRI-Python"],
         "license_file": "LICENSE.cpython.txt",
         "python_tag": "cp313",