Invalid characters and post-update-cmd error on composer update Laravel

Want to update any dependencies show below error

1 - [ErrorException]
Invalid characters passed for attempted conversion, these have been ignored

2 - Script php artisan optimize handling the post-update-cmd event returned with error code 1

composer file:

{
"name": "laravel/laravel",
"description": "The Laravel Framework.",
"keywords": [
    "framework",
    "laravel"
],
"license": "MIT",
"type": "project",
"require": {
    "php": ">=7.4.3",
    "laravel/framework": "5.2.*",
    "league/flysystem-aws-s3-v3": "~1.0",
    "yajra/laravel-datatables-oracle": "~6.0",
    "laravel/socialite": "^2.0",
    "skovmand/mailchimp-laravel": "1.*",
    "barryvdh/laravel-dompdf": "0.6.*",
    "google/cloud": "^0.135.0",
    "superbalist/flysystem-google-storage": "^7.2",
    "php-ffmpeg/php-ffmpeg": "^0.16.0"
},
"require-dev": {
    "fzaninotto/faker": "~1.4",
    "mockery/mockery": "0.9.*",
    "phpunit/phpunit": "~4.0",
    "symfony/css-selector": "2.8.*|3.0.*",
    "symfony/dom-crawler": "2.8.*|3.0.*"
},
"autoload": {
    "classmap": [
        "database"
    ],
    "psr-4": {
        "App\\": "app/"
    }
},
"autoload-dev": {
    "classmap": [
        "tests/TestCase.php"
    ]
},
"scripts": {
    "post-root-package-install": [
        "php -r \"copy('.env.example', '.env');\""
    ],
    "post-create-project-cmd": [
        "php artisan key:generate"
    ],
    "post-install-cmd": [
        "Illuminate\\Foundation\\ComposerScripts::postInstall",
        "php artisan optimize"
    ],
    "post-update-cmd": [
        "Illuminate\\Foundation\\ComposerScripts::postUpdate",
        "php artisan optimize"
    ]
},
"config": {
    "preferred-install": "dist"
}

}

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