prehashed]' expected type 'string', got unconvertible type 'bool', value: 'false'

[arete]

Describe the bug

VaultSharp Version
1.17.5.1

Vault Version
hashicorp/vault:1.21.2

Does this work with Vault CLI?
Yes/No

Sample Code Snippet
`var signOptions = new SignRequestOptions
{
BatchInput = new List
{
new SignSingleInput
{

            Base64EncodedInput = base64Input,
            MarshalingAlgorithm = MarshalingAlgorithm.jws
        }
    }
    };

    // 3. Chiamata a Vault
    var result = await _vaultClient.V1.Secrets.Transit
        .SignDataAsync(_keyName, signOptions);`

Exception Details/Stack Trace/Error Message
`aultSharp.Core.VaultApiException: {"errors":["1 error occurred:\n\t* failed to parse batch input: 1 error(s) decod
ing:\n\n* '[0][prehashed]' expected type 'string', got unconvertible type 'bool', value: 'false'\n\n"]}

at VaultSharp.Core.Polymath.MakeRequestAsync[TResponse](String resourcePath, HttpMethod httpMethod, Object reque
stData, IDictionary2 headers, Boolean rawResponse, Action1 postResponseAction)
at VaultSharp.Core.Polymath.MakeVaultApiRequest[TResponse](String resourcePath, HttpMethod httpMethod, Object re
questData, Boolean rawResponse, Action1 postResponseAction, String wrapTimeToLive, Boolean unauthenticated) at VaultSharp.Core.Polymath.MakeVaultApiRequest[TResponse](String mountPoint, String path, HttpMethod httpMethod , Object requestData, Boolean rawResponse, Action1 postResponseAction, String wrapTimeToLive, Boolean unauthentica
ted)
at VaultSharp.V1.SecretsEngines.Transit.TransitSecretsEngineProvider.SignDataAsync(String keyName, SignRequestOp
tions signOptions, String mountPoint, String wrapTimeToLive)
`

Any additional info
Helpful info