[jnigen] Update pubspec.yaml (https://github.com/dart-lang/jnigen/issues/57)

pkgs/jni/pubspec.yaml

diff --git a/pkgs/jni/pubspec.yaml b/pkgs/jni/pubspec.yaml
index 2a65d6b..7940182 100644
--- a/pkgs/jni/pubspec.yaml
+++ b/pkgs/jni/pubspec.yaml
@@ -1,7 +1,7 @@
 name: jni
 description: Library to access JNI from dart and flutter
 version: 0.1.0
-homepage: https://github.com/dart-lang/jnigen
+repository: https://github.com/dart-lang/jnigen/tree/main/jni
 
 environment:
   sdk: ">=2.17.1 <3.0.0"