Fix tracing.py (#7065)

Author: bong-furiosa

vllm/tracing.py

@@ -15,7 +15,7 @@
         OTEL_EXPORTER_OTLP_TRACES_PROTOCOL)
     from opentelemetry.sdk.trace import TracerProvider
     from opentelemetry.sdk.trace.export import BatchSpanProcessor
-    from opentelemetry.semconv.ai import SpanAttributes as BaseSpanAttributes
+    from opentelemetry.semconv_ai import SpanAttributes as BaseSpanAttributes
     from opentelemetry.trace import SpanKind, Tracer, set_tracer_provider
     from opentelemetry.trace.propagation.tracecontext import (
         TraceContextTextMapPropagator)