fix: data_collection_permissions requires 'required' property, bump min version to 140

AMO expects { required: false } not { collect_user_data: false }.
Bumped strict_min_version to 140.0 (when data_collection_permissions
was introduced). Version 0.9.8.

https://claude.ai/code/session_01KF4i7Ra7zCEDskxDBaNtcT

manifest.firefox.json

@@ -1,14 +1,14 @@
 {
   "manifest_version": 3,
   "name": "Silent Send",
-  "version": "0.9.7",
+  "version": "0.9.8",
   "description": "Intercepts personal info and substitutes it with user-defined replacements before sending to AI services.",
   "browser_specific_settings": {
     "gecko": {
       "id": "silent-send@example.com",
-      "strict_min_version": "128.0",
+      "strict_min_version": "140.0",
       "data_collection_permissions": {
-        "collect_user_data": false
+        "required": false
       }
     }
   },