We got OpenStack and STACKIT IDs mixed up in our documentation previously. The OpenStack project ID is required in the `clouds.yaml` file, while the STACKIT project ID is required in the Constellation config. This fixes the warning for the OpenStack project ID in `clouds.yaml`, and adds an additional warning for the STACKIT project ID in the configuration section.
Some upgrade (possibly due to a too-eagerly merged PR) missed upgrading certain parts of the K8s versions. This fixes that by manually aligning to the newest version.
