Bump flutter_braintree from 3.0.0 to 4.0.0 (#2410)

Bumps [flutter_braintree](https://github.com/pikaju/flutter-braintree) from 3.0.0 to 4.0.0.
- [Changelog](https://github.com/pikaju/flutter-braintree/blob/main/CHANGELOG.md)
- [Commits](https://github.com/pikaju/flutter-braintree/commits)

---
updated-dependencies:
- dependency-name: flutter_braintree
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pubspec.lock

@@ -410,10 +410,10 @@ packages:
     dependency: "direct main"
     description:
       name: flutter_braintree
-      sha256: d364251cf57c028e8481869222d571c90df819ae234d9fb349713c4ffa25ba96
+      sha256: d58a91212c21f97aa1e8fcbcbb394744eb5997c7ba929274daf3cf903ceef8db
       url: "https://pub.dev"
     source: hosted
-    version: "3.0.0"
+    version: "4.0.0"
   flutter_cache_manager:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -35,7 +35,7 @@ dependencies:
 
   flutter:
     sdk: flutter
-  flutter_braintree: ^3.0.0
+  flutter_braintree: ^4.0.0
   flutter_cache_manager: ^3.3.1
   flutter_local_notifications: ^16.3.2
   flutter_localizations: