docs: update the badge alt and the link url to the latest

Author: EchoEllet

README.md

@@ -4,7 +4,7 @@
 <a href="https://pub.dev/packages/native_image_picker_macos"><img src="https://img.shields.io/pub/v/native_image_picker_macos" alt="Pub Version"></a>
 <a href="https://github.com/CompileKernel/native-image-picker-macos"><img src="https://img.shields.io/github/stars/CompileKernel/native-image-picker-macos" alt="Star on Github"></a>
 <a href="https://opensource.org/licenses/MIT"><img src="https://img.shields.io/badge/license-MIT-purple.svg" alt="License: MIT"></a>
-<a href="https://github.com/CompileKernel/native-image-picker-macos/actions"><img src="https://img.shields.io/endpoint?url=https://gist.githubusercontent.com/EchoEllet/e115a2922ddd4f9f897b6e2c15d6c071/raw/f124cf89029e23dab8889cedcd611eee62f6b23b/native-image-picker-macos-coverage-badge.json" alt="Dart Coverage"></a>
+<a href="https://github.com/CompileKernel/native-image-picker-macos/actions"><img src="https://img.shields.io/endpoint?url=https://gist.githubusercontent.com/EchoEllet/e115a2922ddd4f9f897b6e2c15d6c071/raw/native-image-picker-macos-coverage-badge.json" alt="Dart Code Coverage"></a>
 </p>
 
 A macOS platform implementation of [`image_picker`](https://pub.dev/packages/image_picker)