Additional improvements for later adoption once Laravel 9 update is merged & tested

[SteJaySulli]

@ziming submitted pr #44 which includes several improvements we should consider for future releases:

• Allowing the use of Laravel 8's built in uncompromised password check where available
• Removal of EOL PHP versions (< 7.4)

At the time of our most recent update we did not want to merge this as it could break support for legacy apps, but I have created this issue for reference as these are good ideas which we may wish to include in the next major version.

[ziming]

A side thought that I have, given that this is a security related package, by continuing to support versions of older PHP & laravel that no longer receive security updates, people will be less likely to update their apps and this in turn hurt their security even more.

Hence I feel is fair to drop EOL Laravel and PHP versions to encourage people to update to a version that at least still receive security patches