Bump Dart (#7313)

Author: robertbastian

CHANGELOG.md

@@ -132,7 +132,7 @@
         - Document deprecated APIs (unicode-org#6890)
         - FFI for most new APIs
         - `ListFormatter::format` now takes a `diplomat::span<const diplomat::string_view_for_slice>` instead of a `diplomat::span<std::string_view>` to handle soundness issues on some platforms (unicode-org#6974)
-    - Dart version `2.1.0-dev.0`
+    - Dart version `2.1.0-dev.0`, `2.1.0-dev.1`
     - NPM version `2.1.0`
 - Utils
     - General

ffi/dart/lib/src/hook_helpers/hashes.dart

@@ -5,7 +5,7 @@
 name: icu4x
 description: > 
   Dart bindings for the Rust `icu` internationalization crate.
-version: 2.1.0-dev.0
+version: 2.1.0-dev.1
 repository: https://github.com/unicode-org/icu4x/tree/main/ffi/dart
 issue_tracker: https://github.com/unicode-org/icu4x/issues?q=is%3Aissue%20is%3Aopen%20label%3AU-flutter