check with new paradox

[mb706]

No description provided.

[mb706]

@pfistfl this PR prepares for the upcoming paradox release, which can already be seen on github: mlr-org/paradox. The new version uses a new syntax to construct ParamSets. This syntax works with both old as well as new paradox versions, so this PR is compatible with both. Besides that, there is also a new workflow which checks against the github version of paradox. It is a bit hack-y, you can also take this out or update the current workflow that you have. This is because paradox on github will not be merged for a few more weeks (until all the other changes are on CRAN and other package maintainers had their time to follow suit). Until then, it is best to check both against CRAN as well as github versions of various packages.
It would also be nice if you could put this on CRAN soon, so we can then update paradox without any revdep problems.

[sebffischer]

This was merged via another PR