Bump to CPython 3.13.0 stable (#339)

Author: zanieb

pythonbuild/downloads.py

@@ -80,10 +80,10 @@
         "python_tag": "cp312",
     },
     "cpython-3.13": {
-        "url": "https://www.python.org/ftp/python/3.13.0/Python-3.13.0rc3.tar.xz",
-        "size": 22527884,
-        "sha256": "c8bc790185af1cb77b75c01cbc1aa642dfdcf97a370d2d10090bc7baa70da57e",
-        "version": "3.13.0rc3",
+        "url": "https://www.python.org/ftp/python/3.13.0/Python-3.13.0.tar.xz",
+        "size": 22532980,
+        "sha256": "086de5882e3cb310d4dca48457522e2e48018ecd43da9cdf827f6a0759efb07d",
+        "version": "3.13.0",
         "licenses": ["Python-2.0", "CNRI-Python"],
         "license_file": "LICENSE.cpython.txt",
         "python_tag": "cp313",