Update requirements.txt

Author: uttamadhikari30-sys

backend/requirements.txt

@@ -1,17 +1,12 @@
-fastapi
-uvicorn[standard]
-SQLAlchemy
-psycopg2-binary
-python-multipart
-pydantic
-passlib[bcrypt]
-python-jose[cryptography]
-python-dotenv
-alembic
-openpyxl
-python-dateutil
-openai
-httpx
-apscheduler
-weasyprint
-pdfplumber
+fastapi==0.103.0
+uvicorn==0.23.2
+psycopg2-binary==2.9.9
+sqlalchemy==2.0.20
+python-dotenv==1.0.0
+pydantic==2.3.0
+passlib[bcrypt]==1.7.4
+python-multipart==0.0.6
+requests==2.31.0
+apscheduler==3.10.3
+email-validator==2.0.0
+openai==1.2.0