chore(deps): bump debian from bookworm-20260202-slim to bookworm-20260421-slim (#3455)

Bumps debian from bookworm-20260202-slim to bookworm-20260421-slim.


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Dockerfile

@@ -16,7 +16,7 @@ RUN cargo chef cook --release --recipe-path recipe.json
 COPY . .
 RUN cargo build --release --bin atuin-server
 
-FROM debian:bookworm-20260202-slim AS runtime
+FROM debian:bookworm-20260421-slim AS runtime
 LABEL org.opencontainers.image.source="https://github.com/atuinsh/atuin" \
   org.opencontainers.image.url="https://atuin.sh" \
   org.opencontainers.image.licenses="MIT"