fix: update sample.json with correct SPFx version and update date

Author: Sandeep-FED

samples/react-application-customizer-feedback-widget/assets/sample.json

@@ -9,24 +9,20 @@
       "An SPFx Application Customizer Extension placed in the bottom placeholder which allows users to input their feedbacks without scrolling down to the end of the page."
     ],
     "creationDateTime": "2023-07-02",
-    "updateDateTime": "2025-05-25",
-    "products": [
-      "SharePoint"
-    ],
+    "updateDateTime": "2025-10-20",
+    "products": ["SharePoint"],
     "metadata": [
       {
         "key": "CLIENT-SIDE-DEV",
         "value": "React"
       },
       {
         "key": "SPFX-VERSION",
-        "value": "1.20.2"
+        "value": "1.21.1"
       }
     ],
-"tags": [],
-    "categories": [
-      "SPFX-APPLICATION-EXTENSION"  
-    ],
+    "tags": [],
+    "categories": ["SPFX-APPLICATION-EXTENSION"],
     "thumbnails": [
       {
         "type": "image",