Compatibility with upcoming paradox CRAN release

[mb706]

Description

Use version-agnostic paradox UI to prepare for new CRAN release: Instead of ParamDbl, ParamInt objects, create ParamSets using ps(param_id = p_int(...)).

Reference to Issues or PRs

194

Comments

CI checks that use the 'dev' version of mlr3 now also use the dev-version of paradox; you can choose to remove this once paradox 1.0.0 is on CRAN.

PR Checklist

Please fill out this PR checklist (see our contributing guidelines for details).

• [X] The title of the pull request summarizes the changes made.
• [X] The PR contains a detailed description of all changes and additions.
• [X] References to related issues or PRs are added.
• [X] The code passes R CMD check and all (unit) tests (see our contributing guidelines for details).
• [X] Enhancements or new feature are equipped with unit tests.
• [X] The changes adhere to the "mlr-style" standards (see our contributing guidelines for details).

[PhilippBach]

I'm merging this PR now for some additional checks to p-paradox... I'll close the issue once the changes are merged to main... Thanks for your help so far!