build(deps-dev): bump grpcio from 1.69.0 to 1.70.0

Bumps [grpcio](https://github.com/grpc/grpc) from 1.69.0 to 1.70.0.
- [Release notes](https://github.com/grpc/grpc/releases)
- [Changelog](https://github.com/grpc/grpc/blob/master/doc/grpc_release_schedule.md)
- [Commits](grpc/grpc@v1.69.0...v1.70.0)

---
updated-dependencies:
- dependency-name: grpcio
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

dev-requirements.txt

@@ -24,7 +24,7 @@ googleapis-common-protos==1.66.0
     # via
     #   opentelemetry-exporter-otlp-proto-grpc
     #   opentelemetry-exporter-otlp-proto-http
-grpcio==1.69.0
+grpcio==1.70.0
     # via
     #   opentelemetry-exporter-otlp-proto-grpc
     #   oteltest