Update rig to v0.9.2 (.ssh/config, .ssh/knownhosts support, ..)

[kke]

Signed-off-by: Kimmo Lehto klehto@mirantis.com

Fixes #422

• Improved ssh private key selection logic, including checking from .ssh/config
• Now possible to point keyPath to a public key file when using agent
• When possible, try to only use the correct signer from agent for the specific key instead of always trying all keys

Read more: k0sproject/rig#73

• Classic ssh host key checking using a known hosts file. When a key is not found for the first time, add it to the file.
• Known hosts file location can be set in .ssh/config UserKnownHostsFile or SSH_KNOWN_HOSTS env
• If the file location is explicitly set to "" or "/dev/null", host key check is disabled.
• Deprecate the host.ssh.hostKey, it's unlikely this is the way anyone is or should be using host key checking.

Read more: k0sproject/rig#75

Updates several child dependencies such as golang.org/x/crypto.