build(deps): update core dependency

- Update core dependency to latest version
- Change git ref from 4ffe883 to a960fe8

Author: fulleni

pubspec.lock

@@ -181,8 +181,8 @@ packages:
     dependency: "direct main"
     description:
       path: "."
-      ref: "4ffe8833b8a042b2b3b68550f682c5aa902a5ccc"
-      resolved-ref: "4ffe8833b8a042b2b3b68550f682c5aa902a5ccc"
+      ref: a960fe8f340fc8b74b651997de45aee10d8435aa
+      resolved-ref: a960fe8f340fc8b74b651997de45aee10d8435aa
       url: "https://github.com/flutter-news-app-full-source-code/core.git"
     source: git
     version: "1.3.1"

pubspec.yaml

@@ -62,7 +62,7 @@ dependency_overrides:
   core:
     git:
       url: https://github.com/flutter-news-app-full-source-code/core.git
-      ref: 4ffe8833b8a042b2b3b68550f682c5aa902a5ccc
+      ref: a960fe8f340fc8b74b651997de45aee10d8435aa
   http_client:
     git:
       url: https://github.com/flutter-news-app-full-source-code/http-client.git