Bump pub to 59406faad8959e332da98260bab894feb8500908

Changes:
```
> git log --format="%C(auto) %h %s" b2c03b4..59406fa
 https://dart.googlesource.com/pub.git/+/59406faa Add 'tag_pattern' feature to git dependencies (4427)
 https://dart.googlesource.com/pub.git/+/141f46ec Use UTC for testing timestamps passed to git (4580)
 https://dart.googlesource.com/pub.git/+/6e9a308d Clarify relationship between Description and ResolvedDescription (4579)
 https://dart.googlesource.com/pub.git/+/935bec68 Move hasMultipleVersions to Description (4576)
 https://dart.googlesource.com/pub.git/+/99e84bc4 Resolve pubspec dependencies relative to the Resolved description of their containing package (4575)
 https://dart.googlesource.com/pub.git/+/0264dd07 Fix dependency_overrides validator in workspaces (4564)
 https://dart.googlesource.com/pub.git/+/21fc6784 Suggest using code-fences in bug template (4556)
 https://dart.googlesource.com/pub.git/+/96d38c78 Improve the bug reporting template (4554)
 https://dart.googlesource.com/pub.git/+/cc6968e6 Fix handling of ignore patterns ending in * (4552)

```

Diff: https://dart.googlesource.com/pub.git/+/b2c03b448a47fdd52800609b9222cd737be3a934..59406faad8959e332da98260bab894feb8500908/
Change-Id: I482de99d3219a9fa6e8e423237b984bb1fbeb499
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/429320
Commit-Queue: Sigurd Meldgaard <[email protected]>
Reviewed-by: Jonas Jensen <[email protected]>

Author: sigurdm

CHANGELOG.md

@@ -38,6 +38,23 @@ constraint][language version] lower bound to 3.9 or greater (`sdk: '^3.9.0'`).
   Container<dynamic>().value('Invocation with missing runtime checks!');
   ```
 
+#### Pub
+
+- Git dependencies can now be version-solved based on git tags.
+
+  Use a `tag_pattern` in the descriptor and a version constraint, and all
+  commits matching the pattern will be considered during resolution. For
+  example:
+
+  ```yaml
+  dependencies:
+    my_dependency:
+      git:
+        url: https://github.com/example/my_dependency
+        tag_pattern: v{{version}}
+      version: ^2.0.1
+  ```
+
 ## 3.8.0
 
 **Released on:** 2025-05-20

DEPS

@@ -140,7 +140,7 @@ vars = {
   "material_color_utilities_rev": "799b6ba2f3f1c28c67cc7e0b4f18e0c7d7f3c03e",
   "native_rev": "6d51ecf34385e5872c43f1856d3fad6349200811", # rolled manually while native assets are experimental
   "protobuf_rev": "b7753f6fc29402679e05e9a510074002f0826d48",
-  "pub_rev": "b2c03b448a47fdd52800609b9222cd737be3a934", # rolled manually
+  "pub_rev": "59406faad8959e332da98260bab894feb8500908", # rolled manually
   "shelf_rev": "082d3ac2d13a98700d8148e8fad8f3e12a6fd0e1",
   "sync_http_rev": "dc54465f07d9652875deeade643256dafa2fbc6c",
   "tar_rev": "5a1ea943e70cdf3fa5e1102cdbb9418bd9b4b81a",