Update requirements.txt

backend/requirements.txt

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+alembic==1.16.4
+annotated-types==0.7.0
+anyio==4.10.0
+fastapi==0.116.1
+greenlet==3.2.4
+idna==3.10
+Mako==1.3.10
+MarkupSafe==3.0.2
+pydantic==2.11.7
+pydantic_core==2.33.2
+sniffio==1.3.1
+SQLAlchemy==2.0.43
+starlette==0.47.2
+typing-inspection==0.4.1
+typing_extensions==4.14.1