CPython 3.15.0a7 -> 3.15.0a8 (#1077)

* Update CPython 3.15 to 3.15.0a7

Author: jjhelmus

pythonbuild/downloads.py

@@ -93,10 +93,10 @@
         "python_tag": "cp314",
     },
     "cpython-3.15": {
-        "url": "https://www.python.org/ftp/python/3.15.0/Python-3.15.0a7.tar.xz",
-        "size": 35004684,
-        "sha256": "8f590c428b7f0d406df928b85737e7a3afa28eddd4d1419410ea809687ed1ea7",
-        "version": "3.15.0a7",
+        "url": "https://www.python.org/ftp/python/3.15.0/Python-3.15.0a8.tar.xz",
+        "size": 35130268,
+        "sha256": "28f1b6358609042ebcc81488ec24569519f50804bb07dc23cc707b281b031c69",
+        "version": "3.15.0a8",
         "licenses": ["Python-2.0", "CNRI-Python"],
         "license_file": "LICENSE.cpython.txt",
         "python_tag": "cp315",