Update Dockerfile

Author: levkk

Dockerfile

@@ -1,9 +1,9 @@
-FROM rust:1.58-slim-buster AS builder
+FROM rust:1 AS builder
 COPY . /app
 WORKDIR /app
 RUN cargo build --release
 
-FROM debian:buster-slim
+FROM debian:bullseye-slim
 COPY --from=builder /app/target/release/pgcat /usr/bin/pgcat
 COPY --from=builder /app/pgcat.toml /etc/pgcat/pgcat.toml
 WORKDIR /etc/pgcat