Bump pub to 30bfc439fedba1ee3daadcf542f1483479bc4909

Changes:
```
> git log --format="%C(auto) %h %s" 8c2e621..30bfc43
 https://dart.googlesource.com/pub.git/+/30bfc439 Delete directories between workspace package and workspace root (4446)
 https://dart.googlesource.com/pub.git/+/3246cfe5 Bump dart-lang/setup-dart in the github-actions group (4449)
 https://dart.googlesource.com/pub.git/+/674127c8 Bump args from 2.5.0 to 2.6.0 (4441)
 https://dart.googlesource.com/pub.git/+/2ce2f753 Bump path from 1.9.0 to 1.9.1 (4443)
 https://dart.googlesource.com/pub.git/+/cbe1c515 Bump http_parser from 4.1.0 to 4.1.1 (4442)
 https://dart.googlesource.com/pub.git/+/6add1063 Bump crypto from 3.0.5 to 3.0.6 (4440)
 https://dart.googlesource.com/pub.git/+/905ac160 Bump typed_data from 1.3.2 to 1.4.0 (4439)
 https://dart.googlesource.com/pub.git/+/85aeff4c Better help message for --enforce-lock-file (4421)
 https://dart.googlesource.com/pub.git/+/8b349a8a fix: symlinks handling (3298)
 https://dart.googlesource.com/pub.git/+/cc5e9dab Merge pull request 4423 from sigurdm/merge_cherry_pick
 https://dart.googlesource.com/pub.git/+/1dc7700a Output validation errors on stdout, slightly prettier formatted (4424)
 https://dart.googlesource.com/pub.git/+/7f6b849c Merge remote-tracking branch 'origin/cherry_pick_better_global_error_message' into merge_cherry_pick
 https://dart.googlesource.com/pub.git/+/ab8b269c Special case global-run message for updated sdk (4419)

```

Diff: https://dart.googlesource.com/pub.git/+/8c2e621c2403cb503cc9959be387d1061a16846a..30bfc439fedba1ee3daadcf542f1483479bc4909/
Change-Id: I5ee078f69de2b9e67a44a55d9ce994554568b6b6
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/398400
Reviewed-by: Jonas Jensen <[email protected]>
Commit-Queue: Sigurd Meldgaard <[email protected]>
Reviewed-by: Sarah Zakarias <[email protected]>

Author: sigurdm

DEPS

@@ -148,7 +148,7 @@ vars = {
   "package_config_rev": "2583a4e2f9382409ba3bcfa4887ef2a2a8a2aee3",
   "pool_rev": "0bac9b20ef61ad8bfdd6b92b565dd12e8e2e2c78",
   "protobuf_rev": "ccf104dbc36929c0f8708285d5f3a8fae206343e",
-  "pub_rev": "8c2e621c2403cb503cc9959be387d1061a16846a", # disable tools/rev_sdk_deps.dart
+  "pub_rev": "30bfc439fedba1ee3daadcf542f1483479bc4909", # disable tools/rev_sdk_deps.dart
   "pub_semver_rev": "ab3eab50cc9f3df650ba7f5571aa2a1ea715dcc8",
   "shelf_rev": "a2708cd8bce88d5e6391b1cb5bbe80b5a072c55a",
   "source_maps_rev": "b20b97003a48d78a1ecba7e46d932ea4b480dd94",