build(cloud): setup-buildx-action picks private buildx automatically

No need to specify custom "version" input

Signed-off-by: David Karlsson <35727626+dvdksn@users.noreply.github.com>

content/manuals/build-cloud/ci.md

@@ -74,7 +74,6 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
         with:
-          version: "lab:latest"
           driver: cloud
           endpoint: "<ORG>/default"
           install: true