Update Talawa to the Latest Flutter and Dart SDK version

[palisadoes]

Is your feature request related to a problem? Please describe.
Our dependabot automated package updates are failing because we are using outdated versions of Flutter and Dart SDK

Describe the solution you'd like

1. Upgrade to the latest stable versions:
   1. Dart v3.3.0
   2. Flutter v3.19.0
2. Update packages to the latest supported versions for these versions of Dart and Flutter
3. Functionality must remain unchanged
4. All tests must pass and be valid

This will probably also require updating the YAML files in the .github/workflows directory where there are many references to software versions

Describe alternatives you've considered

• N/A

Approach to be followed (optional)

• N/A

Additional context

1. Dart SDK latest stable version information:
   1. https://dart.dev/get-dart
2. Flutter latest stable version information:
   1. https://docs.flutter.dev/release/release-notes
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[GlenDsza]

@palisadoes I would like to work on this task

[Olatade]

@GlenDsza Our policy is to assign no more than two issues to each contributor across all repositories. This way everyone gets a chance to participate in the projects. We sometimes give exceptions for more urgent cases and sometimes we lose track, but the policy stands. You have reached your limit, please wait until your existing issues are closed before requesting more issues. You could unassign yourself from one of the other issues too.

[Mihan786Chistie]

Hey @palisadoes @Olatade I would like to work on this issue

[github-actions]

This issue did not get any activity in the past 10 days and will be closed in 180 days if no update occurs. Please check if the develop branch has fixed it and report again or close the issue.

[Cioppolo14]

Unassigning due to no activity or open PR.

[ArinNigam]

I would like to work on this issue.

[ArinNigam]

Github Workflows Passed Successfully

So the migration is successful only if I comment out this particular code from the codebase

As I asked in slack about the following error I was not able to get any particular method to fix this as of now if anyone knows they can pin this message and comment regarding the same.

If you want I can raise a PR on the flutter migration to 3.19.0 which would be useful since it will also close this issue #2401 and this particular linting issue can be handled in a different issue.

@Cioppolo14 Requesting for suggestions and reviews about the same.

[Cioppolo14]

@ArinNigam Can you make a PR to proceed with this issue, and a new issue for the linting one? Please confirm there isn't an issue out there for the linting already, and when making it describe the issue as best possible. Thank you!