add laravel 9 support

[binotaliu]

• update composer.json to add Laravel 9
• update github workflow to include Laravel 9
  • I need to add -W flag when installing livewire v2, otherwise there will be a conflict when running P8 - L9.* prefer-lowest
  • Livewire v1 only support Laravel version < 9, so I am excluding them for Laravel 9.

[aarondfrancis]

This looks good to me! Thank you for doing this.

I do have one question about the testing matrix. Was there a reason you specifically chose livewire/livewire:^2.3.10 vs livewire/livewire:^2 like it was before?

I'm going to go ahead and merge since that's just a testing thing, but I'd be curious the reasoning behind it!

Thanks again.

[binotaliu]

With -W I need to add --prefer-lowest on it. At first Composer tried to use livewire/livewire:v2.0.0 and then test failed.

Because LivewireTest is using
Livewire:: getPersistentMiddleware() and this method doesn't exist until v2.3.10.

[ralphjsmit]

@aarondfrancis Nice! Do you mind creating a release for this?😊