feat: upgrade chromadb to v1.1.0, improve types

- update imports and include handling for chromadb v1.1.0  
- fix mypy and typing_compat issues (required, typeddict, voyageai)  
- refine embedderconfig typing and allow base provider instances  
- handle mem0 as special case for external memory storage  
- bump tools and clean up redundant deps

src/crewai/rag/embeddings/providers/openai/openai_provider.py

@@ -17,8 +17,8 @@ class OpenAIProvider(BaseEmbeddingsProvider[OpenAIEmbeddingFunction]):
         default=OpenAIEmbeddingFunction,
         description="OpenAI embedding function class",
     )
-    api_key: str = Field(
-        description="OpenAI API key", validation_alias="OPENAI_API_KEY"
+    api_key: str | None = Field(
+        default=None, description="OpenAI API key", validation_alias="OPENAI_API_KEY"
     )
     model_name: str = Field(
         default="text-embedding-ada-002",