replaced the deprecated pedantic package with the new lints package

[danger-ahead]

Details

pedantic v1.1 is deprecated. lints is the new recommendation from the dart team. (https://pub.dev/documentation/pedantic/latest/)
Used the recommended lint options with the new lints package.

Pull Request Process

1. Ensure any install or build dependencies are removed before the end of the layer when doing a build.
2. Update the README.md if needed with details of changes to the interface, this includes new environment variables, exposed ports, useful file locations and container parameters.
3. Increase the version numbers in any examples files and the README.md to the new version that this Pull Request would represent. The versioning scheme we use is SemVer.
4. You may merge the Pull Request in once you have the sign-off of one developer, or if you do not have permission to do that, you may request the second reviewer to merge it for you.

[danger-ahead]

@aagarwal1012 Please review the changes.

[weeklies]

Since this is a Flutter package, how about using https://pub.dev/packages/flutter_lints?