Bump pub to e519de6b6da5aea4f78e58f8906059cc6c2a5993

Changes:
```
> git log --format="%C(auto) %h %s" 5b5fdd3..e519de6
 https://dart.googlesource.com/pub.git/+/e519de6b Refactor `Entrypoint.rootDir` preparing for workspaces (4179)
 https://dart.googlesource.com/pub.git/+/c60b1a05 Allow relative path-dependencies from git dependencies
 https://dart.googlesource.com/pub.git/+/e08f7202 Make ensureUpToDate static (4171)
 https://dart.googlesource.com/pub.git/+/539457d2 More robust snapshot deletion (4170)
 https://dart.googlesource.com/pub.git/+/3b837a17 Show progress while downloading dependencies (4175)
 https://dart.googlesource.com/pub.git/+/4e48ab75 Use resident compiler to start test runner (4174)
 https://dart.googlesource.com/pub.git/+/6758a570 Fix typo (4173)
 https://dart.googlesource.com/pub.git/+/93dc0a1e Use the 'pub_display_url' field in advisories in output of pub get/up… (4172)
 https://dart.googlesource.com/pub.git/+/039ca5e4 Remove Entrypoint._configRoot (4169)
 https://dart.googlesource.com/pub.git/+/85304da4 Refactor test setup for security advisories (4167)
 https://dart.googlesource.com/pub.git/+/161bee84 Move helpers inside ensureUpToDate (4166)
 https://dart.googlesource.com/pub.git/+/badcd8d7 Mention zshrc as possible shell config file (4163)
 https://dart.googlesource.com/pub.git/+/44bd80e4 isUpToDate based on package_config.json (4160)
 https://dart.googlesource.com/pub.git/+/98823618 fix: False detection of non-ignored files with non-ascii unicode characters (4145)
 https://dart.googlesource.com/pub.git/+/4743a455 Support for resolving all packages in workspace together (4154)
 https://dart.googlesource.com/pub.git/+/89376e84 Make FlutterSDK singleton, and move static members to non-static (4159)

```

Diff: https://dart.googlesource.com/pub.git/+/5b5fdd320a3b60a6a00bdd3122f03c6f67a39eeb..e519de6b6da5aea4f78e58f8906059cc6c2a5993/
Change-Id: I20a86848c72b4eddf0fab62c7d54815ff2221203
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/357880
Reviewed-by: Jonas Jensen <[email protected]>
Commit-Queue: Sigurd Meldgaard <[email protected]>

CHANGELOG.md

@@ -59,6 +59,8 @@ advantage of these improvements, set your package's
   `ignored_advisories` section in the `pubspec.yaml` file. To learn more about
   pub's support for security advisories, visit
   [dart.dev/go/pub-security-advisories][pub-security-advisories].
+- `path`-dependencies inside `git`-dependencies are now resolved relative to the git
+  repo.
 - New command `dart pub unpack` that downloads a package from pub.dev and
   extracts it to a subfolder of the current directory.
 

DEPS

@@ -168,7 +168,7 @@ vars = {
   "path_rev": "a7b696071bd83d3ee0a0f1b57ac94d6b1f05cac4",
   "pool_rev": "c118f69d8a6441a8453bf7d455fd7c79d3ee1497",
   "protobuf_rev": "b7613581d847e1e36e76f0e36db3a412d8fea5b1",
-  "pub_rev": "5b5fdd320a3b60a6a00bdd3122f03c6f67a39eeb", # disable tools/rev_sdk_deps.dart
+  "pub_rev": "e519de6b6da5aea4f78e58f8906059cc6c2a5993", # disable tools/rev_sdk_deps.dart
   "pub_semver_rev": "3175ba0a58a96fb23f8d68b5f5c44d1a5b30cc16",
   "shelf_rev": "1acbc673326e5b31280184744f2864a8f92c5b46",
   "source_map_stack_trace_rev": "c75649651d01826236e3ab7093d277a70756905a",