Bouncy Castle's X509V3CertificateGenerator.SetSignatureAlgorithm marked obsolete. What do I do?

Question

I am trying to create a self-signed trusted certificate. I am using Bouncy Castle from nuget, and the answer on this question. This is the code on that page:

Answer 1

Even with the code of Lourens I couldn't get it to work and the certificate wouldn't be accepted by chrome. I had to add in the CreateSelfSignedCertificateBasedOnCertificateAuthorityPrivateKey the following code to get it working.

       // Subject Alternative Name 
        var alternativeNames = subjectAlternativeNames.Select(n => new GeneralName(GeneralName.DnsName, n)).ToArray();
        var subjectAlternativeNamesExtension = new DerSequence(alternativeNames);
        certificateGenerator.AddExtension(X509Extensions.SubjectAlternativeName.Id, false, subjectAlternativeNamesExtension);

        //Key Usage
        certificateGenerator.AddExtension(X509Extensions.KeyUsage, true, new KeyUsage(KeyUsage.DigitalSignature | KeyUsage.KeyEncipherment));

By the way changed also the following line

certificateGenerator.AddExtension(X509Extensions.ExtendedKeyUsage.Id, false, new ExtendedKeyUsage( new [] { KeyPurposeID.IdKPClientAuth, KeyPurposeID.IdKPServerAuth}));