Bump CPython 3.13 to 3.13.8 (#813)

Author: zanieb

pythonbuild/downloads.py

@@ -84,10 +84,10 @@
         "python_tag": "cp312",
     },
     "cpython-3.13": {
-        "url": "https://www.python.org/ftp/python/3.13.7/Python-3.13.7.tar.xz",
-        "size": 22769492,
-        "sha256": "5462f9099dfd30e238def83c71d91897d8caa5ff6ebc7a50f14d4802cdaaa79a",
-        "version": "3.13.7",
+        "url": "https://www.python.org/ftp/python/3.13.8/Python-3.13.8.tar.xz",
+        "size": 22681576,
+        "sha256": "b9910730526b298299b46b35595ced9055722df60c06ad6301f6a4e2c728a252",
+        "version": "3.13.8",
         "licenses": ["Python-2.0", "CNRI-Python"],
         "license_file": "LICENSE.cpython.txt",
         "python_tag": "cp313",