build(deps): update core package reference

- Update core package reference from 93ca190 to 064c438
- This change affects both pubspec.lock and pubspec.yaml files

Author: fulleni

pubspec.lock

@@ -117,8 +117,8 @@ packages:
     dependency: "direct main"
     description:
       path: "."
-      ref: "93ca1905f72d708a156721519d663b2853b865f3"
-      resolved-ref: "93ca1905f72d708a156721519d663b2853b865f3"
+      ref: "064c4387b3f7df835565c41c918dc2d80dd2f49a"
+      resolved-ref: "064c4387b3f7df835565c41c918dc2d80dd2f49a"
       url: "https://github.com/flutter-news-app-full-source-code/core.git"
     source: git
     version: "1.3.1"

pubspec.yaml

@@ -59,7 +59,7 @@ dependency_overrides:
   core:
     git:
       url: https://github.com/flutter-news-app-full-source-code/core.git
-      ref: 93ca1905f72d708a156721519d663b2853b865f3
+      ref: 064c4387b3f7df835565c41c918dc2d80dd2f49a
   http_client:
     git:
       url: https://github.com/flutter-news-app-full-source-code/http-client.git