Bump intl from 0.19.0 to 0.20.0 in /experimental/pedometer/example

Bumps [intl](https://github.com/dart-lang/i18n/tree/main/pkgs) from 0.19.0 to 0.20.0.
- [Release notes](https://github.com/dart-lang/i18n/releases)
- [Commits](https://github.com/dart-lang/i18n/commits/intl-v0.20.0/pkgs)

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

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

experimental/pedometer/example/pubspec.yaml

@@ -40,7 +40,7 @@ dependencies:
     path: ../
 
   ffi: ^2.1.2
-  intl: ^0.19.0
+  intl: ^0.20.0
   jni: ^0.12.0
   fl_chart: ^0.69.0