docs: update logback MDC dependency name to opentelemetry-logback-mdc-1.0

Author: jinseopkim0

OBSERVABILITY.md

@@ -96,7 +96,7 @@ GAX and Google Cloud Java libraries use SLF4J for logging. Include an SLF4J impl
 
 To correlate logs with Cloud Trace, ensure that active trace and span IDs are propagated to your logging framework's Mapped Diagnostic Context (MDC):
 1. Use the [OpenTelemetry Javaagent](https://opentelemetry.io/docs/zero-code/java/agent/), which automatically instruments logging frameworks.
-2. Or add the `opentelemetry-logback-mdc-provider` dependency to your project to configure MDC propagation.
+2. Or add the `opentelemetry-logback-mdc-1.0` dependency to your project to configure MDC propagation.
 
 Once the MDC is populated with `trace_id` and `span_id`, the Google Cloud Logging Logback appender automatically maps these to the trace and span fields in Cloud Logging, allowing you to view correlated logs and traces in the Google Cloud Console.