Add 1.21.9-pre1 data to web version info

Author: booky10

web/src/main/resources/public/mc_versions.json

@@ -1,4 +1,22 @@
 [
+  {
+    "id": "1.21.9-pre1",
+    "name": "1.21.9 Pre-Release 1",
+    "world_version": 4549,
+    "series_id": "main",
+    "protocol_version": 1073742093,
+    "pack_version": {
+      "resource_major": 69,
+      "resource_minor": 0,
+      "data_major": 87,
+      "data_minor": 1
+    },
+    "build_time": "2025-09-16T12:07:00+00:00",
+    "java_component": "java-runtime-delta",
+    "java_version": 21,
+    "stable": false,
+    "use_editor": false
+  },
   {
     "id": "25w37a",
     "name": "25w37a",