Bump go.opentelemetry.io/otel/exporters/stdout/stdouttrace in /service

Bumps [go.opentelemetry.io/otel/exporters/stdout/stdouttrace](https://github.com/open-telemetry/opentelemetry-go) from 1.20.0 to 1.21.0.
- [Release notes](https://github.com/open-telemetry/opentelemetry-go/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-go/blob/main/CHANGELOG.md)
- [Commits](open-telemetry/opentelemetry-go@v1.20.0...v1.21.0)

---
updated-dependencies:
- dependency-name: go.opentelemetry.io/otel/exporters/stdout/stdouttrace
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

service/go.mod

@@ -27,19 +27,19 @@ require (
 	go.opentelemetry.io/collector/receiver v0.89.0
 	go.opentelemetry.io/collector/semconv v0.89.0
 	go.opentelemetry.io/contrib/propagators/b3 v1.20.0
-	go.opentelemetry.io/otel v1.20.0
+	go.opentelemetry.io/otel v1.21.0
 	go.opentelemetry.io/otel/bridge/opencensus v0.43.0
 	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v0.43.0
 	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp v0.43.0
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.20.0
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp v1.20.0
 	go.opentelemetry.io/otel/exporters/prometheus v0.43.0
 	go.opentelemetry.io/otel/exporters/stdout/stdoutmetric v0.43.0
-	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.20.0
-	go.opentelemetry.io/otel/metric v1.20.0
-	go.opentelemetry.io/otel/sdk v1.20.0
+	go.opentelemetry.io/otel/exporters/stdout/stdouttrace v1.21.0
+	go.opentelemetry.io/otel/metric v1.21.0
+	go.opentelemetry.io/otel/sdk v1.21.0
 	go.opentelemetry.io/otel/sdk/metric v1.20.0
-	go.opentelemetry.io/otel/trace v1.20.0
+	go.opentelemetry.io/otel/trace v1.21.0
 	go.uber.org/multierr v1.11.0
 	go.uber.org/zap v1.26.0
 	gonum.org/v1/gonum v0.14.0