Sync client lazily initialized; sandbox dataplane ops unblocked

What's Changed

• release(js): bump js sdk version to 0.7.12 by @KiewanVillatel in https://github.com/langchain-ai/langsmith-sdk/pull/3089
• feat(sandbox): do not gate dataplane ops on sandbox status by @ramon-langchain in https://github.com/langchain-ai/langsmith-sdk/pull/3090
• chore: sync langsmith_api by @langtions-bot[bot] in https://github.com/langchain-ai/langsmith-sdk/pull/3095
• ci: pin all GitHub Actions to immutable SHA pins by @jkennedyvz in https://github.com/langchain-ai/langsmith-sdk/pull/3093
• chore(deps-dev): bump vcrpy from 8.1.1 to 8.2.1 in /python by @dependabot[bot] in https://github.com/langchain-ai/langsmith-sdk/pull/3074
• chore(deps): bump pydantic-settings from 2.13.1 to 2.14.2 in /python by @dependabot[bot] in https://github.com/langchain-ai/langsmith-sdk/pull/3075
• feat(sandbox): expose registries via generated v2 client by @langchain-infra in https://github.com/langchain-ai/langsmith-sdk/pull/3087
• fix(client): lazily initialize sync OpenAPI client by @KiewanVillatel in https://github.com/langchain-ai/langsmith-sdk/pull/3099
• release(python): bump py version to 0.9.3 by @KiewanVillatel in https://github.com/langchain-ai/langsmith-sdk/pull/3101

Full Changelog: https://github.com/langchain-ai/langsmith-sdk/compare/v0.9.2...v0.9.3