docker(deps): Bump python from 3.12-slim to 3.13-slim

Bumps python from 3.12-slim to 3.13-slim.

---
updated-dependencies:
- dependency-name: python
  dependency-version: 3.13-slim
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Dockerfile

@@ -1,5 +1,5 @@
 # Multi-stage build for production-ready MCP as a Judge server
-FROM python:3.12-slim AS builder
+FROM python:3.13-slim AS builder
 
 # Set build arguments
 ARG PORT=8050
@@ -34,7 +34,7 @@ RUN .venv/bin/pip install uv
 RUN .venv/bin/uv pip install -e .
 
 # Production stage
-FROM python:3.12-slim AS production
+FROM python:3.13-slim AS production
 
 # Set build arguments
 ARG PORT=8050