index: Add Door Lock and Access Control Add-on v1.2.0

- Updated nrfconnect.json file

Signed-off-by: Marcin Kajor <marcin.kajor@nordicsemi.no>

Author: markaj-nordic

index/nrfconnect.json

@@ -408,6 +408,12 @@
       "avatar": "https://avatars.githubusercontent.com/u/40860733?s=200&v=4",
       "docsUrl": "https://nrfconnectdocs.nordicsemi.com/addons/door_lock_and_access_control/latest/index.html",
       "releases": [
+        {
+          "tag": "v1.2.0",
+          "name": "Door Lock and Access Control v1.2.0",
+          "date": "2026-09-10T00:00:00Z",
+          "sdk": "v3.4.0"
+        },
         {
           "tag": "v1.1.1",
           "name": "Door Lock and Access Control v1.1.1",
@@ -433,7 +439,7 @@
           "sdk": "v3.2.0"
         }
       ],
-      "defaultBranch": "v1.1.1"
+      "defaultBranch": "v1.2.0"
     },
     {
       "name": "quickstart-bluetooth",