build(deps): bump flutter_slidable from 3.1.2 to 4.0.0 in /optimus

Bumps [flutter_slidable](https://github.com/letsar/flutter_slidable) from 3.1.2 to 4.0.0.
- [Release notes](https://github.com/letsar/flutter_slidable/releases)
- [Changelog](https://github.com/letsar/flutter_slidable/blob/master/CHANGELOG.md)
- [Commits](https://github.com/letsar/flutter_slidable/commits/v4.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

optimus/pubspec.yaml

@@ -11,7 +11,7 @@ dependencies:
   dfunc: ^0.10.0
   flutter:
     sdk: flutter
-  flutter_slidable: ">=1.2.0 <4.0.0"
+  flutter_slidable: ">=1.2.0 <5.0.0"
   flutter_svg: ^2.0.7
   freezed_annotation: ">=1.0.0 <3.0.0"
   intl: ">=0.17.0 <0.20.0"