Use RSA-SHA2-256 when signing ssh certificates with an RSA key #33
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Description
This PR replaces the default RSA hash algorithm of x/crypto/ssh, SHA-1 (ssh-rsa) with SHA256 (rsa-sha2-256).
This new signature scheme has been supported since 2016 with OpenSSH 7.2. And on OpenSSH 8.2 was announced that ssh-rsa will be deprecated, and it has been removed in OpenSSH 8.8