Class 'Symfony\Component\Yaml\Parser' not found

Ran `composer require pragmarx/version`, then `php artisan vendor:publish --provider="PragmaRX\Version\Package\ServiceProvider"`.

Then when I refresh my app, I get the error
> Class 'Symfony\Component\Yaml\Parser' not found

This is within a Homestead environment using:
- Laravel 8.18.1
- PHP 7.4.10
- Composer 2.0.12

I tried installing Symfony, but it keeps erroring out and it appears that Symfony is already installed though. `composer require symfony/yaml`

Reproduce the failure in the stated Homestead environment after running `composer require pragmarx/version` and the vendor publish command. Start by checking the installed dependency versions and why `Symfony\Component\Yaml\Parser` is unavailable; done means the package installs and refreshing the Laravel app no longer raises the missing-class error.

Written by the indexing model from the issue text.