2.33.0

Various fixes & improvements

• feat(langchain): Support BaseCallbackManager (#4486) by @szokeasaurusrex
• Use span.data instead of measurements for token usage (#4567) by @antonpirker
• Fix custom model name (#4569) by @antonpirker
• fix: shut down "session flusher" more promptly (#4561) by @bukzor
• chore: Remove Lambda urllib3 pin on Python 3.10+ (#4549) by @sentrivana