The best option is upgrade OpenSSH in the server.
If you can't upgrade the server, you can create new keys using ed25519, or ecdsa.
ed25519
ecdsa
ssh-keygen -t ecdsa -a 64 -b 384
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The best option is upgrade OpenSSH in the server.
If you can't upgrade the server, you can create new keys using
ed25519, orecdsa.