Fix csv reader encoding issue

[github-actions[bot]]

☂️ Python Coverage

current status: ✅

Overall Coverage

Lines	Covered	Coverage	Threshold	Status
2664	1614	61%	50%	🟢

New Files

No new covered files...

Modified Files

File	Coverage	Status
src/pai_rag/integrations/readers/pai_csv_reader.py	74%	🟢
src/pai_rag/integrations/readers/pai_excel_reader.py	89%	🟢
TOTAL	82%	🟢

updated for commit: 3adcb39 by action🐍