bug: public key presented not for certificate signature

[KirillKurdyukov]

fail: Ydb.Sdk.Pool.GrpcChannelFactory[0]
      Failed to verify remote certificate!
      Org.BouncyCastle.Security.InvalidKeyException: Public key presented not for certificate signature
         at Org.BouncyCastle.X509.X509Certificate.CheckSignature(IVerifierFactory verifier) in /_/crypto/src/x509/X509Certificate.cs:line 656
         at Org.BouncyCastle.X509.X509Certificate.Verify(AsymmetricKeyParameter key) in /_/crypto/src/x509/X509Certificate.cs:line 623
         at Ydb.Sdk.Pool.GrpcChannelFactory.<>c__DisplayClass4_0.<CreateChannel>b__0(Object _, X509Certificate certificate, X509Chain _, SslPolicyErrors sslPolicyErrors)

Fail to connect YDB Dedicated from Yandex Cloud.