Trying minimal version of requirements

app.py

@@ -2,11 +2,9 @@ from haystack.components.generators import OpenAIGenerator
 from haystack.utils import Secret
 from haystack.components.builders.prompt_builder import PromptBuilder
 from haystack.components.routers import ConditionalRouter
-from haystack_integrations.document_stores.chroma import ChromaDocumentStore
 from haystack import Pipeline
 from haystack.components.writers import DocumentWriter
 from haystack.components.embedders import SentenceTransformersTextEmbedder, SentenceTransformersDocumentEmbedder
-from haystack_integrations.components.retrievers.chroma import ChromaEmbeddingRetriever
 from haystack.components.preprocessors import DocumentSplitter
 from haystack.components.converters.txt import TextFileToDocument
 from haystack.components.preprocessors import DocumentCleaner