v1.6.0-rc.3

• Move OCI and command line checks for runtime to internal oci package
• Bump libnvidia-container dependency to 1.6.0-rc.3

Changes from libnvidia-container

• Bump nvidia-modprobe dependency to 495.44

NOTE: This release is the first unified release of the NVIDIA Container Toolkit that consists of the following packages:

• libnvidia-container 1.6.0-rc.3
• nvidia-container-toolkit 1.6.0-rc.3
• nvidia-container-runtime 3.6.0-rc.3
• nvidia-docker2 2.7.0-rc.3

The packages for this release are published to the libnvidia-container package repositories as experimental.