Bump jnigen from 0.12.2 to 0.13.0 in /experimental/pedometer (#2554)

Bumps [jnigen](https://github.com/dart-lang/native/tree/main/pkgs) from 0.12.2 to 0.13.0.
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experimental/pedometer/pubspec.yaml

@@ -15,7 +15,7 @@ dependencies:
 
 dev_dependencies:
   ffigen: ^16.0.0
-  jnigen: ^0.12.1
+  jnigen: ^0.13.0
   flutter_test:
     sdk: flutter
   flutter_lints: ^5.0.0