Upgrade requirements doctrine to ^3.

[abkrim]

Problem 1
- laravel/nova is locked to version 3.15.0 and an update of this package was not requested.
- laravel/nova 3.15.0 requires doctrine/dbal ^2.9 -> found doctrine/dbal[v2.9.0, ..., 2.12.x-dev] but it conflicts with your root composer.json require (^3.0).

[crynobone]

Only Laravel Framework 8 support Doctrine 3 while Laravel Nova 3.x provide support for Laravel Framework v7 and v8.

At the moment it's not safe to allow "doctrine/dbal": "^2.9|^3.0" as this would break Laravel Framework v7 if v3.0 get resolved.

[abkrim]

I don't understand well.

You say: " Laravel Nova 3.x provide support for Laravel Framework v7 and v8."

I've Laravel Framework 8, and Laravel Nova 3

"require": {
        "php": "^7.3",
        "ext-json": "*",
        "64robots/nova-fields": "^0.17.0",
        "armincms/json": "^0.5.1",
        "david-griffiths/nova-dark-theme": "^1.0",
        "fideloper/proxy": "^4.2",
        "fruitcake/laravel-cors": "^1.0",
        "gregoriohc/laravel-nova-theme-responsive": "^0.8.1",
        "guzzlehttp/guzzle": "^7.0.1",
        "laravel/framework": "^8.0",
        "laravel/horizon": "^5.0",
        "laravel/nova": "~3.0",
        "laravel/tinker": "^2.0",
        "maatwebsite/excel": "^3.1",
        "spatie/ssh": "^1.4"
    },

but

composer require doctrine/dbal
Using version ^3.0 for doctrine/dbal
./composer.json has been updated
Running composer update doctrine/dbal
Loading composer repositories with package information
Updating dependencies
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - laravel/nova is locked to version 3.15.0 and an update of this package was not requested.
    - laravel/nova 3.15.0 requires doctrine/dbal ^2.9 -> found doctrine/dbal[v2.9.0, ..., 2.12.x-dev] but it conflicts with your root composer.json require (^3.0).

[crynobone]

1. laravel/nova already require "doctrine/dbal": "^2.9" so that application should already be able to use it.
2. doctrine/dbal v3 is only supported by laravel/framework v8 and above.
3. laravel/nova supports laravel/framework v7 and v8.
4. allowing laravel/nova to require doctrine/dbal v3 will cause issues to everyone using Laravel Nova with Laravel Framework v7.

[crynobone]

Marking this as next-series or when we removed support for Laravel Framework 7. Will revisit this when the time come.