Bump webview_flutter from 3.0.4 to 4.0.1

Bumps [webview_flutter](https://github.com/flutter/plugins/tree/main/packages/webview_flutter) from 3.0.4 to 4.0.1.
- [Release notes](https://github.com/flutter/plugins/releases)
- [Commits](https://github.com/flutter/plugins/commits/webview_flutter-v4.0.1/packages/webview_flutter)

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

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

Author: dependabot[bot]

pubspec.yaml

@@ -41,7 +41,7 @@ dependencies:
   shared_preferences: ^2.0.13
   url_launcher: ^6.0.20
   url_strategy: ^0.2.0
-  webview_flutter: ^3.0.1
+  webview_flutter: ^4.0.1
   flutter_countdown_timer: ^4.1.0
   hive: ^2.2.3
   hive_flutter: ^1.1.0