Add installation of "llama-index-embeddings-huggingface_api"

The exercise in building the pipeline at line 145 needs this package. Currently, it's throwing an error:

["ModuleNotFoundError"](ModuleNotFoundError: No module named 'llama_index.embeddings.huggingface_api')

unit2/llama-index/components.ipynb

@@ -23,7 +23,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "!pip install llama-index datasets llama-index-callbacks-arize-phoenix llama-index-vector-stores-chroma llama-index-llms-huggingface-api -U -q"
+    "!pip install llama-index datasets llama-index-callbacks-arize-phoenix llama-index-vector-stores-chroma llama-index-llms-huggingface-api llama-index-embeddings-huggingface_api -U -q"
    ]
   },
   {