Fix support for publishing to 3rd-party pub repository with path in t…

…he hosted-url

This adds the following commits:
dart-lang/pub@b9edfa5

Change-Id: Ia52dd2b6aa797006ddb3e686cfccf4d382dc9355
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/221626
Auto-Submit: Jonas Jensen <jonasfj@google.com>
Commit-Queue: Alexander Thomas <athom@google.com>
Reviewed-by: Alexander Thomas <athom@google.com>

DEPS

@@ -140,7 +140,7 @@ vars = {
   "pool_rev": "7abe634002a1ba8a0928eded086062f1307ccfae",
   "process_rev": "56ece43b53b64c63ae51ec184b76bd5360c28d0b",
   "protobuf_rev": "c1eb6cb51af39ccbaa1a8e19349546586a5c8e31",
-  "pub_rev": "96404e0749864c9fbf8b12e1d424e8078809e00a",
+  "pub_rev": "b9edfa5e288ea3d1a57d1db054ef844ae7b27d99",
   "pub_semver_rev": "a43ad72fb6b7869607581b5fedcb186d1e74276a",
   "root_certificates_rev": "692f6d6488af68e0121317a9c2c9eb393eb0ee50",
   "rust_revision": "b7856f695d65a8ebc846754f97d15814bcb1c244",