Failing ssh access to nodes using RSA key after RHOCP 4 upgrade.

Issue

• SSH to RHCOS nodes is not possible after the upgrade to RHOCP 4.13.
• oc debug node is working but not SSH for accessing a node.

• Accessing a node using the correct SSH key is reporting:

  $ ssh -i sshkey core@10.0.0.1
  core@10.0.0.1: Permission denied (publickey,gssapi-keyex,gssapi-with-mic).
  

• On the SSH daemon logs the following error is recorded while the the SSH attempt fails:

  userauth_pubkey: key type ssh-rsa not in PubkeyAcceptedAlgorithms [preauth]