Bump build_runner from 2.1.8 to 2.1.10 in /jsonexample (#1082)

Bumps [build_runner](https://github.com/dart-lang/build) from 2.1.8 to 2.1.10.
- [Release notes](https://github.com/dart-lang/build/releases)
- [Commits](https://github.com/dart-lang/build/compare/build_daemon-v2.1.8...build_runner-v2.1.10)

---
updated-dependencies:
- dependency-name: build_runner
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

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

jsonexample/pubspec.yaml

@@ -21,7 +21,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
-  build_runner: ^2.0.4
+  build_runner: ^2.1.10
   built_value_generator: ^8.2.0
   json_serializable: ^6.1.6
   flutter_lints: ^1.0.0