fix environment

environment.yml

 name: ollama
 dependencies:
-  - conda-forge::python=3.11.9
-  - conda-forge::pip=24.0
   - conda-forge::ipykernel=6.28.0
+  - conda-forge::pip=24.0
+  - conda-forge::python=3.11.9
   - pip:
+      - chromadb==0.5.13
       - llama-index-core==0.10.62
       - llama-index-llms-ollama==0.2.2
-      - llama-index-embeddings-nomic==0.4.0
-      - nomic[local]==3.1.1
+      - llama-index-readers-file==0.1.33
       - ollama==0.3.1