tidak bisa deploy aplikasi laravel ke heroku

Permisi gan,ada yang tau gimana cara nanganin error pas mau push file laravel ke heroku?saya baru pertama kali ini mau nge deploy aplikasi laravel ke heroku dan udah cari cara2nya tapi tetap gak berhasil..untuk hasil errornya ada di bawah.

remote:        In fortify.php line 106:
remote:
remote:          Class 'Laravel\Fortify\Features' not found
remote:
remote:
remote:        Script @php artisan package:discover --ansi handling the post-autoload-dump event returned with error code 1
remote:  !     WARNING: There was a class not found error in your code
remote:
remote:  !     ERROR: Dependency installation failed!
remote:  !
remote:  !     The 'composer install' process failed with an error. The cause
remote:  !     may be the download or installation of packages, or a pre- or
remote:  !     post-install hook (e.g. a 'post-install-cmd' item in 'scripts')
remote:  !     in your 'composer.json'.
remote:  !
remote:  !     Typical error cases are out-of-date or missing parts of code,
remote:  !     timeouts when making external connections, or memory limits.
remote:  !
remote:  !     Check the above error output closely to determine the cause of
remote:  !     the problem, ensure the code you're pushing is functioning
remote:  !     properly, and that all local changes are committed correctly.
remote:  !
remote:  !     For more information on builds for PHP on Heroku, refer to
remote:  !     https://devcenter.heroku.com/articles/php-support
remote:  !
remote:  !     REMINDER: the following warnings were emitted during the build;
remote:  !     check the details above, as they may be related to this error:
remote:  !     - Your 'composer.lock' is out of date!
remote:  !     - There was a class not found error in your code
remote:
remote:  !     Push rejected, failed to compile PHP app.
remote:
remote:  !     Push failed
remote: Verifying deploy...
remote:
remote: !       Push rejected to service-ibis-hotel-admin.
remote:
To https://git.heroku.com/service-ibis-hotel-admin.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/service-ibis-hotel-admin.git'

composer.json

{
    "name": "laravel/laravel",
    "type": "project",
    "description": "The Laravel Framework.",
    "keywords": [
        "framework",
        "laravel"
    ],
    "license": "MIT",
    "require": {
        "php": "^7.3",
        "fideloper/proxy": "^4.2",
        "guzzlehttp/guzzle": "^7.0.1",
        "laravel/framework": "^8.0",
        "laravel/sanctum": "^2.6",
        "laravel/tinker": "^2.0"
    },
    "require-dev": {
        "facade/ignition": "^2.3.6",
        "fzaninotto/faker": "^1.9.1",
        "mockery/mockery": "^1.3.1",
        "nunomaduro/collision": "^5.0",
        "phpunit/phpunit": "^9.3"
    },
    "config": {
        "optimize-autoloader": true,
        "preferred-install": "dist",
        "sort-packages": true
    },
    "extra": {
        "laravel": {
            "dont-discover": []
        }
    },
    "autoload": {
        "psr-4": {
            "App\\": "app/",
            "Database\\Factories\\": "database/factories/",
            "Database\\Seeders\\": "database/seeders/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Tests\\": "tests/"
        }
    },
    "minimum-stability": "dev",
    "prefer-stable": true,
    "scripts": {
        "post-autoload-dump": [
            "Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
            "@php artisan package:discover --ansi"
        ],
        "post-root-package-install": [
            "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "@php artisan key:generate --ansi"
        ]
    }
}

Bila ada yang kurang jelas silahkan boleh ditanyain lagi..