⚙ Added the option to specify php-version: latest

[marekdedic]

A Pull Request should be associated with an Issue.

If you're fixing a bug, adding a new feature or improving something please provide the details in Issues,
so that the development can be pointed in the intended direction.

Related issue: #293

Further notes in Contribution Guidelines
Thank you for your contribution.

Description

This PR enables you to specify php-version: latest.

In case this PR introduced TypeScript/JavaScript code changes:

• I have written test cases for the changes in this pull request
• I have run npm run format before the commit.
• I have run npm run lint before the commit.
• I have run npm run release before the commit.
• npm test returns with no unit test errors and all code covered.

[marekdedic]

Hmm, didn't realize you've already added this in develop, so closing... :)

Thanks!