Fix PHP8 deprecation in `Generator::getFormRules`

[viki53]

Fixes mtrajano/laravel-swagger#60

To anyone already using this repo and needing to use this fix for the time being, you can use the following info in your composer.json:

    "repositories": {
        "laravel-swagger-php8": {
            "type": "package",
            "package": {
                "name": "mtrajano/laravel-swagger",
                "version": "0.6.5",
                "source": {
                    "url": "https://github.com/viki53/laravel-swagger.git",
                    "type": "git",
                    "reference": "origin/master"
                }
            }
        }
    },

This will override your version with my repo without needing to change your dependencies list, that way you can just remove this config later when this repo is updated with the fix.

[MaFx]

Hi @viki53 can you please add 8.0 and 8.1 to .travis.yml so builds are run for those versions?

[viki53]

Done!

Let me know if there's anything else I can do to help :)

[mtrajano]

Hey @viki53 thank you for the pr, sorry I didn't get around to it sooner. I think there's still a few things clashing with 8.1 (At least one of them being that ArrayAccess::offsetExists now has a return type), might just be about adjusting the versions of passport and testbanch as well. Going to take a look a little bit later today and see if I can resolve those as well and fix these all at once

[viki53]

@mtrajano Hi, sorry to bother you, is there any news? Do you need me to update/fix something?