chore(deps): bump fastlane-plugin-flutter_version (#4760)

Bumps [fastlane-plugin-flutter_version](https://github.com/tianhaoz95/fastlane-plugin-flutter-version) from `274f4b3` to `20966d4`.
- [Release notes](https://github.com/tianhaoz95/fastlane-plugin-flutter-version/releases)
- [Commits](tianhaoz95/fastlane-plugin-flutter_version@274f4b3...20966d4)

---
updated-dependencies:
- dependency-name: fastlane-plugin-flutter_version
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

packages/smooth_app/ios/Gemfile.lock

@@ -1,6 +1,6 @@
 GIT
   remote: https://github.com/tianhaoz95/fastlane-plugin-flutter-version
-  revision: 274f4b3985c823e928dc07b64a465d7576d70cac
+  revision: 20966d43d5ef4af3388d74bf1a2272e8a6c95852
   specs:
     fastlane-plugin-flutter_version (1.1.15)