pyupgrade
Using `pyupgrade` to get all `partners` code up to 3.9 standards (mostly, fixing old `typing` imports).
- Complete unit test - Fix spelling error
**Description:** Adds chroma to the partners package. Tests & code mirror those in the community package. **Dependencies:** None **Twitter handle:** @akiradev0x --------- Co-authored-by: Erick Friis <erick@langchain.dev>