Bump rxdart from 0.27.7 to 0.28.0

Bumps [rxdart](https://github.com/ReactiveX/rxdart) from 0.27.7 to 0.28.0.
- [Release notes](https://github.com/ReactiveX/rxdart/releases)
- [Commits](ReactiveX/rxdart@0.27.7...0.28.0)

---
updated-dependencies:
- dependency-name: rxdart
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

pubspec.lock

@@ -431,10 +431,10 @@ packages:
     dependency: "direct main"
     description:
       name: rxdart
-      sha256: "0c7c0cedd93788d996e33041ffecda924cc54389199cde4e6a34b440f50044cb"
+      sha256: "5c3004a4a8dbb94bd4bf5412a4def4acdaa12e12f269737a5751369e12d1a962"
       url: "https://pub.dev"
     source: hosted
-    version: "0.27.7"
+    version: "0.28.0"
   shelf:
     dependency: transitive
     description:

pubspec.yaml

@@ -13,7 +13,7 @@ dependencies:
     sdk: flutter
   http: ^1.2.1
   meta: ^1.11.0
-  rxdart: ^0.27.7
+  rxdart: ">=0.27.7 <0.29.0"
   uuid: ^4.3.3
   webview_flutter: ^4.7.0
   webview_flutter_android: ^3.16.1