fix(kurrentdb): bump KurrentDB.Client to 1.4.1 to stop unobserved read task exceptions - #573

'ZipkinExporterHelperExtensions.AddZipkinExporter(TracerProviderBuilder)' is obsolete: 'The Zipkin exporter is obsolete and will be removed in a future release. Consider using the OpenTelemetry.Exporter.OpenTelemetryProtocol NuGet package instead. See https://opentelemetry.io/blog/2025/deprecating-zipkin-exporters/ for more information.'