Workflow fix and tests update

[aon4o]

• Fixed failing linter GitHub action.
• Changed PHP testing framework (PHPUnit to Pest)

[freekmurze]

Thanks for your work on this. Let me know when this is ready for review.

[aon4o]

This code update is ready for review on its own. Right now I am working on an additional branch for namespace separation of translations (#168). Should I first finish the feature I'm working on and add it to this PR or open another one after I'm done? Thanks for the fast response on the PR!

[aon4o]

Hey, I think I have addressed all of the requested changes in the commits from the past 4 hours.

[aon4o]

Hi, I hope you're doing well. I don't want to bother you, but I wanted to follow up on the pull request. I have addressed all the changes you requested and would appreciate it if you could take a look when you have the time.

[freekmurze]

Looks good, a small nitpick.

Are there any breaking changes here?

[aon4o]

Looks good, a small nitpick.

Are there any breaking changes here?

No, there are none. The sole purpose of this PR is to modernize the codebase so I could easily implement the Namespaces Feature from the 174 PR.

[aon4o]

Is there anything else I can do here? If not could I ask again for a review of the changes when you have the time?

[aon4o]

Requesting a review?

[freekmurze]

There are some conflicts. Could you rebase?

[aon4o]

Fixed the conflict. The tests still pass.

[freekmurze]

Thank you very much! Very nice!