issue-156: update debian version (#157)

Dockerfile

@@ -6,14 +6,14 @@ COPY Cargo.toml Cargo.lock ./
 COPY src ./src
 RUN cargo chef prepare --recipe-path recipe.json
 
-FROM chef AS builder 
+FROM chef AS builder
 COPY --from=planner /app/recipe.json recipe.json
 RUN cargo chef cook --release --recipe-path recipe.json
 COPY Cargo.toml Cargo.lock ./
 COPY src ./src
 RUN cargo build --release --bin gitlobster
 
-FROM debian:bullseye-slim AS runtime
+FROM debian:bookworm-slim AS runtime
 COPY --from=builder /app/target/release/gitlobster /usr/local/bin/gitlobster
 RUN apt update && apt install -yqq ca-certificates git
 ENTRYPOINT ["/usr/local/bin/gitlobster"]