Update package_config

Bump pub

```
> git log --format="%C(auto) %h %s" 70b1a4f9229a36bac6340ec7eae2b2068baac96c..9f2ddc02f066c68fb638ff65fbb73761ece23267
 9f2ddc02 Use uris for paths in git source descriptions (#3063)
 97a0033e Update README.md (#3069)
 2ef10adf Roll setup-dart (#3054)
 4b5450d3 Updated repository specification. (#3050)
 0f3055db Add executables to allErrors (#3048)
```

Change-Id: Iaa42df2339b6f62aeb63e0f2e7eaf062da84e7c6
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/209681
Reviewed-by: Jonas Jensen <[email protected]>
Commit-Queue: Sigurd Meldgaard <[email protected]>

Author: sigurdm

DEPS

@@ -141,7 +141,7 @@ vars = {
   "pool_rev": "7abe634002a1ba8a0928eded086062f1307ccfae",
   "process_rev": "56ece43b53b64c63ae51ec184b76bd5360c28d0b",
   "protobuf_rev": "c1eb6cb51af39ccbaa1a8e19349546586a5c8e31",
-  "pub_rev": "70b1a4f9229a36bac6340ec7eae2b2068baac96c",
+  "pub_rev": "9f2ddc02f066c68fb638ff65fbb73761ece23267",
   "pub_semver_rev": "f50d80ef10c4b2fa5f4c8878036a4d9342c0cc82",
   "resource_rev": "6b79867d0becf5395e5819a75720963b8298e9a7",
   "root_certificates_rev": "692f6d6488af68e0121317a9c2c9eb393eb0ee50",