Revert "Roll pub"

This reverts commit 41381e9.

Reason for revert: pub fails on startup if git is not installed; b/175080640

Original change's description:
> Roll pub
>
> a7e448b2 pub upgrade --major-versions (#2784)
> 06bcff09 pub upgrade foo, only unlocks foo from pubspec.lock (#2781)
> aa20a4bd Usage exceptions no stacktrace (#2776)
> 14e12bf6 Clarify error message when spawning a subprocess fails (#2763)
> 5ef0a0e7 Added a pub upgrade --nullsafety mode (#2741)
> 9cde2406 Fix pub remove --dry-run (#2774)
> 7426be94 Remove hack now issue has been fixed (#2773)
> 90a1f776 Limit retries in test to avoid timeout (#2765)
> 3aa327c7 Stop depending on .packages (#2764)
>
> Change-Id: Ifd8a8402c4628e7278b6fedfd2ca7902004fa6e8
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/175241
> Auto-Submit: Jonas Jensen <[email protected]>
> Reviewed-by: Sigurd Meldgaard <[email protected]>
> Commit-Queue: Sigurd Meldgaard <[email protected]>

[email protected],[email protected]

Change-Id: I29b20b4a2dc037146dd27c8fe6e6ecce6833e7b6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/175303
Reviewed-by: David Morgan <[email protected]>
Commit-Queue: David Morgan <[email protected]>

Author: davidmorgan

CHANGELOG.md

@@ -117,23 +117,9 @@ Updated the Linter to `0.1.126`, which includes:
 * New command `dart pub add` that adds  new dependencies to your `pubspec.yaml`.
 
   And a corresponding `dart pub remove` that removes dependencies.
-* New option `dart pub upgrade --major-versions` will update constraints in
-  your `pubspec.yaml` to match the the _resolvable_ column reported in
-  `dart pub outdated`. This allows users to easily upgrade to latest version for
-  all dependencies where this is possible, even if such upgrade requires an
-  update to the version constraint in `pubspec.yaml`.
-
-  It is also possible to only upgrade the major version for a subset of your
-  dependencies using `dart pub upgrade --major-versions <dependencies...>`.
-* New option `dart pub upgrade --null-safety` will attempt to update constraints
-  in your `pubspec.yaml`, such that only null-safety migrated versions of
-  dependencies are allowed.
 * New option `dart pub outdated --mode=null-safety` that will analyze your
   dependencies for null-safety.
 * `dart pub publish` will now check your pubspec keys for likely typos.
-* `dart pub upgrade package_foo` will fetch dependencies, but ignore the
-  `pubspec.lock` for `package_foo`, allowing users to only upgrade a subset of
-  dependencies.
 * New command `dart pub login` that logs in to pub.dev.
 * The `--server` option to `dart pub publish` and `dart pub uploader` have been
   deprecated. Use `publish_to` in your `pubspec.yaml` or set the

DEPS

@@ -133,7 +133,7 @@ vars = {
   "ply_rev": "604b32590ffad5cbb82e4afef1d305512d06ae93",
   "pool_rev": "7abe634002a1ba8a0928eded086062f1307ccfae",
   "protobuf_rev": "0d03fd588df69e9863e2a2efc0059dee8f18d5b2",
-  "pub_rev": "a7e448b2b4743cebfc464b7973019c57f0a3b5a1",
+  "pub_rev": "228e69e53862879c283c42b98086aa7536012a66",
   "pub_semver_rev": "10569a1e867e909cf5db201f73118020453e5db8",
   "resource_rev": "6b79867d0becf5395e5819a75720963b8298e9a7",
   "root_certificates_rev": "7e5ec82c99677a2e5b95ce296c4d68b0d3378ed8",