Bump golang.org/x/net from 0.21.0 to 0.23.0 in /cmd/mdatagen

Bumps [golang.org/x/net](https://github.com/golang/net) from 0.21.0 to 0.23.0.
- [Commits](golang/net@v0.21.0...v0.23.0)

---
updated-dependencies:
- dependency-name: golang.org/x/net
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

cmd/mdatagen/go.mod

@@ -46,8 +46,8 @@ require (
 	go.opentelemetry.io/otel/exporters/prometheus v0.46.0 // indirect
 	go.opentelemetry.io/otel/sdk v1.24.0 // indirect
 	go.opentelemetry.io/otel/sdk/metric v1.24.0 // indirect
-	golang.org/x/net v0.21.0 // indirect
-	golang.org/x/sys v0.17.0 // indirect
+	golang.org/x/net v0.23.0 // indirect
+	golang.org/x/sys v0.18.0 // indirect
 	google.golang.org/genproto/googleapis/rpc v0.0.0-20240123012728-ef4313101c80 // indirect
 	google.golang.org/grpc v1.62.0 // indirect
 	google.golang.org/protobuf v1.32.0 // indirect