Bump flutter_riverpod from 1.0.4 to 2.0.2 in /simplistic_calculator (#1457)

Bumps [flutter_riverpod](https://github.com/rrousselGit/riverpod) from 1.0.4 to 2.0.2.
- [Release notes](https://github.com/rrousselGit/riverpod/releases)
- [Commits](https://github.com/rrousselGit/riverpod/commits)

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

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simplistic_calculator/pubspec.yaml

@@ -14,7 +14,7 @@ dependencies:
   flutter:
     sdk: flutter
   flutter_layout_grid: ^2.0.1
-  flutter_riverpod: ^1.0.3
+  flutter_riverpod: ^2.0.2
   math_expressions: ^2.3.0
   window_size: 
     git: