Bump pub.

New commits include:
```
git log --format="%C(auto) %h %s"
3c14d86a67db7207bbc9f654ac49ee60e08e5240..d159e5b9f04a7e4826b6afea7b3364d48aa0dad8
 d159e5b9 Validate and normalize hosted url. (#3030)
 12411d60 fail CI on info level issues; fix directives sorting (#3036)
 ab41ef0a Downgraded does_not_include_dot_file.dart to 2.10 (#3027)
```

Change-Id: I58e11393c5d6099406d3ba1884f69768395c7a0f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/206364
Reviewed-by: William Hesse <[email protected]>
Commit-Queue: William Hesse <[email protected]>
Auto-Submit: Jonas Jensen <[email protected]>

DEPS

@@ -141,7 +141,7 @@ vars = {
   "pool_rev": "7abe634002a1ba8a0928eded086062f1307ccfae",
   "process_rev": "56ece43b53b64c63ae51ec184b76bd5360c28d0b",
   "protobuf_rev": "0d03fd588df69e9863e2a2efc0059dee8f18d5b2",
-  "pub_rev": "3c14d86a67db7207bbc9f654ac49ee60e08e5240",
+  "pub_rev": "d159e5b9f04a7e4826b6afea7b3364d48aa0dad8",
   "pub_semver_rev": "f50d80ef10c4b2fa5f4c8878036a4d9342c0cc82",
   "resource_rev": "6b79867d0becf5395e5819a75720963b8298e9a7",
   "root_certificates_rev": "692f6d6488af68e0121317a9c2c9eb393eb0ee50",