Sync pub client to newest version

```
git log --oneline --no-decorate 980fc947db32bca6ae7d07fbb4ad0fcdba0050ec..3c060aae47985e9a248b850f1d0450304a5c97e3
3c060aae Usage: pub global activate <package> [version-constraint] (#2051)
93783b60 Improve the error when encountering a non-local package with a path dep
2b4056b0 Lint tweaks for Dart 2.2
135e10af Update last modified date directly in `touch` (#2014)
```

No relevant changes for the changelog

Bug: #36026
Change-Id: I2dcaad614f5fbd511712d4713c7b008d7ff710f1
Reviewed-on: https://dart-review.googlesource.com/c/94744
Reviewed-by: Jonas Jensen <[email protected]>
Commit-Queue: Sigurd Meldgaard <[email protected]>

Author: sigurdm

DEPS

@@ -112,7 +112,7 @@ vars = {
   "ply_rev": "604b32590ffad5cbb82e4afef1d305512d06ae93",
   "pool_tag": "1.3.6",
   "protobuf_tag": "0.9.0",
-  "pub_rev": "980fc947db32bca6ae7d07fbb4ad0fcdba0050ec",
+  "pub_rev": "3c060aae47985e9a248b850f1d0450304a5c97e3",
   "pub_semver_tag": "1.4.2",
   "quiver_tag": "2.0.0+1",
   "resource_rev": "2.1.5",