Bump jnigen from 0.3.0 to 0.4.0 in /experimental/pedometer (#1771)

Bumps [jnigen](https://github.com/dart-lang/jnigen) from 0.3.0 to 0.4.0.
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experimental/pedometer/pubspec.yaml

@@ -16,7 +16,7 @@ dependencies:
 
 dev_dependencies:
   ffigen: ^7.2.1
-  jnigen: ^0.3.0
+  jnigen: ^0.4.0
   flutter_test:
     sdk: flutter
   flutter_lints: ^2.0.0