You are trying to create a one-off dyno in a Shield space and are getting an error after upgrading to Mac OS Ventura.
CLIError: There was a problem connecting to the dyno. Confirm that your ssh key is added to your agent by running `ssh-add`. Check that your ssh key has been uploaded to heroku with `heroku keys:add`. See https://devcenter.heroku.com/articles/one-off-dynos#shield-private-spaces
Mac OS Ventura utilizes the recent update of OpenSSH 9 which disables RSA signatures using the SHA-1 hash algorithm. You will need to generate new keys with a more secure algorithm such as ED25519 or ECDSA.