Update python to 3.12

Dockerfile

@@ -8,7 +8,7 @@ COPY frontend/ ./
 RUN npm run build
 
 # Build backend
-FROM python:3.9-slim
+FROM python:3.12-slim
 WORKDIR /app
 
 # Create non-root user

backend/Dockerfile.dev

@@ -1,4 +1,4 @@
-FROM python:3.9-slim
+FROM python:3.12-slim
 
 WORKDIR /app
 

backend/pyproject.toml

@@ -5,7 +5,7 @@ description = "Backend for the Open LLM Leaderboard"
 authors = ["Your Name <your.email@example.com>"]
 
 [tool.poetry.dependencies]
-python = "^3.9"
+python = "^3.12"
 fastapi = "^0.115.6"
 uvicorn = {extras = ["standard"], version = "^0.34.0"}
 numpy = "^2.2.0"