Update dependencies to up-to-date versions

Updated dependencies:

• Minimal PHP version to 8.0
• Symfony YAML: both ^5.0, ^6.0 are supported
• Latest Swagger UI ^4.0

Updated symfony yaml dependency to 5.*

Merge pull request #3 from justcoded/develop

Updated symfony yaml dependency

Upgrade faker

Fzanio faker package is deprecated, so we connected up to date dependency.

Update faker dependency

Updated faker package dependency to be more flexible and compatible with other packages.

First stable

Stable release of merge/faker tools