fix: private gpt example was broken due to changes in chroma

Signed-off-by: Matt Williams <m@technovangelist.com>

examples/langchain-python-rag-privategpt/constants.py

@@ -6,7 +6,7 @@ PERSIST_DIRECTORY = os.environ.get('PERSIST_DIRECTORY', 'db')
 
 # Define the Chroma settings
 CHROMA_SETTINGS = Settings(
-        chroma_db_impl='duckdb+parquet',
+        # chroma_db_impl='duckdb+parquet',
         persist_directory=PERSIST_DIRECTORY,
         anonymized_telemetry=False
 )