Fix deprecated NewBuildInfoCollector API

Update `examples/random/main.go`:
  `prometheus.NewBuildInfoCollector` is deprecated. Use `collectors.NewBuildInfoCollector` instead.

Signed-off-by: alissa-tung <[email protected]>

Author: alissa-tung

Diff for: examples/random/main.go

@@ -26,6 +26,7 @@ import (
 	"time"
 
 	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/collectors"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
@@ -67,7 +68,7 @@ func main() {
 	prometheus.MustRegister(rpcDurations)
 	prometheus.MustRegister(rpcDurationsHistogram)
 	// Add Go module build info.
-	prometheus.MustRegister(prometheus.NewBuildInfoCollector())
+	prometheus.MustRegister(collectors.NewBuildInfoCollector())
 
 	start := time.Now()