Update opentelemetry-go monorepo to v1.38.0

This MR contains the following updates:

Package	Change	Age	Confidence
go.opentelemetry.io/otel	v1.37.0 -> v1.38.0
go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp	v1.37.0 -> v1.38.0
go.opentelemetry.io/otel/exporters/stdout/stdouttrace	v1.37.0 -> v1.38.0
go.opentelemetry.io/otel/sdk	v1.37.0 -> v1.38.0
go.opentelemetry.io/otel/trace	v1.37.0 -> v1.38.0

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