Upgrade to 3.14.0rc2 (and temporarily use GitHub's runners on Windows) (#754)

- **Bump CPython to 3.14.0rc2**
- **Drop the Depot Windows runner**

Author: zanieb

ci-runners.yaml

@@ -25,11 +25,6 @@ macos-latest:
   platform: darwin
   free: true
 
-depot-windows-2022-8:
-  arch: x86_64
-  platform: windows
-  free: false
-
 windows-latest-large:
   arch: x86_64
   platform: windows

pythonbuild/downloads.py

@@ -82,10 +82,10 @@
         "python_tag": "cp313",
     },
     "cpython-3.14": {
-        "url": "https://www.python.org/ftp/python/3.14.0/Python-3.14.0rc1.tar.xz",
-        "size": 23661916,
-        "sha256": "8707780ae9f19c5bf5b9f27827181ba11cdad7bb292ea49cad5424331e40ee8b",
-        "version": "3.14.0rc1",
+        "url": "https://www.python.org/ftp/python/3.14.0/Python-3.14.0rc2.tar.xz",
+        "size": 23566140,
+        "sha256": "bc62854cf232345bd22c9091a68464e01e056c6473a3fffa84572c8a342da656",
+        "version": "3.14.0rc2",
         "licenses": ["Python-2.0", "CNRI-Python"],
         "license_file": "LICENSE.cpython.txt",
         "python_tag": "cp314",