build(deps): update core dependency to latest commit

- Update core dependency in pubspec.yaml and pubspec.lock
- Change ref from b01f9b457d4faaa6fab58f67ebc09d93314e6b10 to 8a03af9af8ccf4920388ddce73062aca2fde1bc9
- This update ensures the project uses the latest version of the core dependency

Author: fulleni

pubspec.lock

@@ -185,8 +185,8 @@ packages:
     dependency: "direct main"
     description:
       path: "."
-      ref: b01f9b457d4faaa6fab58f67ebc09d93314e6b10
-      resolved-ref: b01f9b457d4faaa6fab58f67ebc09d93314e6b10
+      ref: "8a03af9af8ccf4920388ddce73062aca2fde1bc9"
+      resolved-ref: "8a03af9af8ccf4920388ddce73062aca2fde1bc9"
       url: "https://github.com/flutter-news-app-full-source-code/core.git"
     source: git
     version: "1.3.1"

pubspec.yaml

@@ -145,7 +145,7 @@ dependency_overrides:
   core:
     git:
       url: https://github.com/flutter-news-app-full-source-code/core.git
-      ref: b01f9b457d4faaa6fab58f67ebc09d93314e6b10
+      ref: 8a03af9af8ccf4920388ddce73062aca2fde1bc9
   http_client:
     git:
       url: https://github.com/flutter-news-app-full-source-code/http-client.git