HttpClient: better re-throw

So that we get the original text (supposedly JSON) that
was being parsed. This would mitigate how horrible this
crash/stacktrace was:

https://github.com/nblockchain/geewallet/actions/runs/5711209999/job/15472500980

src/JsonRpcSharp.HttpClient/HttpClient.cs

@@ -105,6 +105,11 @@ protected override async Task<RpcResponseMessage> SendAsync(RpcRequestMessage re
                         var originalText = GetOriginalText(streamReader);
                         throw new DeserializationException(originalText, e);
                     }
+                    catch (JsonSerializationException e)
+                    {
+                        var originalText = GetOriginalText(streamReader);
+                        throw new DeserializationException(originalText, e);
+                    }
                     /* for debugging purposes
                     finally
                     {