Bump go.opentelemetry.io/otel in /examples/demo/server

Bumps [go.opentelemetry.io/otel](https://github.com/open-telemetry/opentelemetry-go) from 1.4.1 to 1.7.0.
- [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@v1.4.1...v1.7.0)

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

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

examples/demo/server/go.mod

@@ -4,23 +4,23 @@ go 1.17
 
 require (
 	go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp v0.29.0
-	go.opentelemetry.io/otel v1.4.1
+	go.opentelemetry.io/otel v1.7.0
 	go.opentelemetry.io/otel/exporters/otlp/otlpmetric v0.27.0
 	go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc v0.27.0
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace v1.4.1
 	go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc v1.4.1
 	go.opentelemetry.io/otel/metric v0.27.0
 	go.opentelemetry.io/otel/sdk v1.4.1
 	go.opentelemetry.io/otel/sdk/metric v0.27.0
-	go.opentelemetry.io/otel/trace v1.4.1
+	go.opentelemetry.io/otel/trace v1.7.0
 	google.golang.org/grpc v1.45.0
 )
 
 require (
 	github.com/cenkalti/backoff/v4 v4.1.2 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/felixge/httpsnoop v1.0.2 // indirect
-	github.com/go-logr/logr v1.2.2 // indirect
+	github.com/go-logr/logr v1.2.3 // indirect
 	github.com/go-logr/stdr v1.2.2 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/grpc-ecosystem/grpc-gateway v1.16.0 // indirect