Bump jni from 0.11.0 to 0.12.0 in /experimental/pedometer

Bumps [jni](https://github.com/dart-lang/native/tree/main/pkgs) from 0.11.0 to 0.12.0.
- [Release notes](https://github.com/dart-lang/native/releases)
- [Commits](https://github.com/dart-lang/native/commits/HEAD/pkgs)

---
updated-dependencies:
- dependency-name: jni
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

experimental/pedometer/pubspec.yaml

@@ -10,7 +10,7 @@ dependencies:
   flutter:
     sdk: flutter
   plugin_platform_interface: ^2.1.8
-  jni: ^0.11.0
+  jni: ^0.12.0
   ffi: ^2.1.2
 
 dev_dependencies: