Update docker debian base image.

Dockerfile

@@ -1,7 +1,7 @@
 # Stage 1: Build the application
 # Use a specific Rust version for reproducibility, slim variant for smaller base
-FROM rust:1.87-slim-bullseye AS builder
-LABEL maintainer="Gemini Code Assist"
+FROM rust:1.87-slim-bookworm AS builder
+LABEL maintainer="Quintus Leung"
 
 # Install system dependencies if needed by any crates (e.g., libssl-dev, pkg-config for TLS/crypto)
 # RUN apt-get update && apt-get install -y libssl-dev pkg-config
@@ -24,7 +24,7 @@ COPY src ./src
 RUN cargo build --release --locked
 
 # Stage 2: Create the final lightweight image
-FROM debian:bullseye-slim AS runner
+FROM debian:bookworm-slim AS runner
 
 # Arguments for user/group creation, can be overridden at build time
 ARG UID=1001