image-optimizer | Yet another node module that will compress and resize

Your composer version seems to be old. Try to install composer like described on getcomposer.org/download/

Remove keyword "array" from protected array $middlewareGroups = [. Should be: protected $middlewareGroups = [. Your IDE probably added this type declaration.

the maddhatter/laravel-fullcalendar dependency need the version 5 of illuminate/support.

So you can't update laravel with this dependency. Moreover, it seems that this project was not updated since 3 years

But a fork exist here.And it works with laravel for 5,6 and 7 https://github.com/nelkasovic/laravel-full-calendar/blob/master/composer.json#L15

As far as I see from your stack trace, the command fails to create a views directory (./resources/views/vendor/l5-swagger).

Note: chown -R www-data:root . - this command can create some new problems..

After that command, owner is www-data (but you start artisan commands as serge).

After that command, group is root (but serge may not be part of that group).

You have to verify that your user (serge) has proper permissions there (./resources/views, ./resources/views/vendor).

To check current permissions run: ls -la ./resources, ls -la ./resources/views, and ls -la ./resources/views/vendor (if vendor exists already)

Maybe you need something like: sudo chmod -R serge.www-data (serge - owner, www-data - group)

However, it mostly depends on your specific setup and desired result.