v2.1.0 k3d-version argument

• k3d-version parameter allowing to specify concrete k3d version (@arkadius)
  • see documentation
• k3d version bump 5.1.0 -> 5.2.2 (@arkadius)

k3d-action	k3d	k3s
v2.1.0	v5.2.2	rancher/k3s:v1.21.7-k3s1 or set image explicitly