Load latest weather dataset

[gjwgit]

Pull Request Details

What issue does this PR address

• Replace the 2007 weather dataset from R with the 2024 dataset as a csv asset file.

• Link to associated issue: #428

Checklist

Complete the check-list below to ensure your branch is ready for PR.

Flutter Style Guide: https://survivor.togaware.com/gnulinux/flutter-style.html

• [X] Screenshots included in linked issue
• [X] Changes adhere to the style and coding guideline
• [X] No confidential information
• [ ] No duplicated content - PLENTY FROM OTHER CODERS - NEEDS FIXING
• [X] No lint check errors related to your changes (make prep or flutter analyze lib)
• [X] Pre-exisiting lint errors noted: NONE
• [X] No integrated test errors
• [X] Tested on at least one device
  • [ ] Android Phone
  • [ ] Android Emulator
  • [ ] Chrome on Android
  • [ ] Chrome
  • [ ] iOS
  • [X] Linux
  • [ ] MacOS
  • [ ] Windows
• [ ] Added two reviewers

Finalising

Once PR discussion is complete and reviewers have approved:

• [ ] Merge dev into the branch
• [ ] Resolve any conflicts
• [ ] Add one line summary into CHANGELOG.md
• [ ] Bump appropriate version number in pubspec.yaml
• [ ] Push to git repository and review
• [ ] Merge PR into dev (gjwgit)

[zheyxu]

All tests passed.