Upgrade non breaking flutter dependencies

[Major version bump]
- connectivity_plus	3.0.2	---->	5.0.2	https://pub.dev/packages/connectivity_plus/changelog
- share_plus		9.0.0	---->	10.1.4	https://pub.dev/packages/share_plus/changelog
- flutter_secure_storage	6.0.0	---->	9.2.4	https://pub.dev/packages/flutter_secure_storage/changelog
- extended_text		13.0.0	---->	14.2.0	https://pub.dev/packages/extended_text/changelog
- flutter_slidable	3.0.1	---->	4.0.0	https://pub.dev/packages/flutter_slidable/changelog
- file_picker		5.2.5	---->	8.3.7	https://pub.dev/packages/file_picker/changelog

Author: Renarde-dev