Update opentelemetry-java version to v1.38.0 (#4468)

Author: opentelemetrybot

content/en/docs/languages/java/_index.md

@@ -7,7 +7,7 @@ aliases: [/java, /java/metrics, /java/tracing]
 cascade:
   vers:
     instrumentation: 2.3.0
-    otel: 1.37.0
+    otel: 1.38.0
     semconv: 1.25.0
 weight: 18
 ---