Bug 1924022 - Use urlopen's context parameter instead of cafile. a=RyanVM

The latter was removed in python 3.13.

Original Revision: https://phabricator.services.mozilla.com/D225318

Differential Revision: https://phabricator.services.mozilla.com/D225606

python/mozboot/mozboot/util.py

@@ -4,6 +4,7 @@
 
 import hashlib
 import os
+import ssl
 from pathlib import Path
 from urllib.request import urlopen
 
@@ -34,7 +35,8 @@ def http_download_and_save(url, dest: Path, hexhash, digest="sha256"):
     that will be used to validate the downloaded file using the given
     digest algorithm.  The value of digest can be any value accepted by
     hashlib.new.  The default digest used is 'sha256'."""
-    f = urlopen(url, cafile=certifi.where())
+    ssl_context = ssl.create_default_context(cafile=certifi.where())
+    f = urlopen(url, context=ssl_context)
     h = hashlib.new(digest)
     with open(dest, "wb") as out:
         while True: