[core] Workaround erroneous urllib Windows proxy parsing (#7092)

Convert proxies extracted from windows registry to http for older Python versions.
See: https://github.com/python/cpython/issues/86793

Authored by: coletdjnz

yt_dlp/compat/urllib/__init__.py

@@ -0,0 +1,7 @@
+# flake8: noqa: F405
+from urllib import *  # noqa: F403
+
+from ..compat_utils import passthrough_module
+
+passthrough_module(__name__, 'urllib')
+del passthrough_module