Add year to experimental browser warning

Co-authored-by: Oleg Bespalov <oleg.bespalov@grafana.com>

js/jsmodules.go

@@ -48,7 +48,7 @@ func getInternalJSModules() map[string]interface{} {
 		"k6/experimental/tracing": tracing.New(),
 		"k6/experimental/browser": newWarnExperimentalModule(browser.NewSync(),
 			"Please update your imports to use k6/browser instead of k6/experimental/browser,"+
-				" which will be removed after September 23rd. Ensure your scripts are migrated by then."+
+				" which will be removed after September 23rd, 2024. Ensure your scripts are migrated by then."+
 				" For more information, see the migration guide at the link:"+
 				" https://grafana.com/docs/k6/latest/using-k6-browser/migrating-to-k6-v0-52/"),
 		"k6/browser":         browser.New(),