Switch MINGW64 to UCRT64 environment
This is a backport of !5900 (merged)
We recently switched 1.3.x
to GitLab's fleet. Since the new CI uses pinned dependencies, this would've set back the package versions for 1.3.x
to an older MINGW64
environment than before. We don't want that, so we bring this up-to-date with the recent changes in master, a fresh set of dependencies using UCRT64
.