Update custom-select.json

Author: mfranzke

showcases/shared/custom-select.json

@@ -2650,7 +2650,7 @@
 					],
 					"label": "Label",
 					"variant": "floating",
-					"id": "id-10300",
+					"id": "id-10301",
 					"validation": "invalid",
 					"invalidMessage": "Invalid Message"
 				},