Bump @opentelemetry/exporter-metrics-otlp-grpc in /cart

Bumps [@opentelemetry/exporter-metrics-otlp-grpc](https://github.com/open-telemetry/opentelemetry-js) from 0.29.1 to 0.29.2.
- [Release notes](https://github.com/open-telemetry/opentelemetry-js/releases)
- [Changelog](https://github.com/open-telemetry/opentelemetry-js/blob/main/CHANGELOG.md)
- [Commits](https://github.com/open-telemetry/opentelemetry-js/commits)

---
updated-dependencies:
- dependency-name: "@opentelemetry/exporter-metrics-otlp-grpc"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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