build(deps): update core dependency to version 1.3.1

- Update git ref in pubspec.yaml and pubspec.lock
- Change ref from b3bf1fbe84c51006c55c0eed7fb5de2f11a95208 to e66e076572bd326e50e9d5286ef5059ff658ed65

Author: fulleni

pubspec.lock

@@ -89,8 +89,8 @@ packages:
     dependency: "direct main"
     description:
       path: "."
-      ref: b3bf1fbe84c51006c55c0eed7fb5de2f11a95208
-      resolved-ref: b3bf1fbe84c51006c55c0eed7fb5de2f11a95208
+      ref: e66e076572bd326e50e9d5286ef5059ff658ed65
+      resolved-ref: e66e076572bd326e50e9d5286ef5059ff658ed65
       url: "https://github.com/flutter-news-app-full-source-code/core.git"
     source: git
     version: "1.3.1"

pubspec.yaml

@@ -94,7 +94,7 @@ dependency_overrides:
   core:
     git:
       url: https://github.com/flutter-news-app-full-source-code/core.git
-      ref: b3bf1fbe84c51006c55c0eed7fb5de2f11a95208
+      ref: e66e076572bd326e50e9d5286ef5059ff658ed65
   http_client:
     git:
       url: https://github.com/flutter-news-app-full-source-code/http-client.git