Upgrade terraform to 0.14

Updated the project to make it compatible with terraform 0.14.

In this process provider dependencies have been updated where applicable.

There's now a lock file in the configuration directory which is checked in to git so that terraform can make the same version selections. With the following command you can check in all versions of all platforms as a developer on this repository.

terraform providers lock -platform=linux_arm64 -platform=linux_amd64 -platform=darwin_amd64 -platform=windows_amd64

This makes the lock file version requirements compatible on all platforms.

Overall, the update has been smooth without anything breaking for this repository and the clusters build as usual.

Builds up on !31 (merged)