Update Dockerfile

crates/k8s-cleaner/Dockerfile

@@ -6,6 +6,6 @@ RUN cargo build --release
 FROM debian:buster-slim
 WORKDIR /usr/local/bin
 RUN apt update && \
-    apt install openssl libffi7 -y
+    apt install libssl1.1 -y
 COPY --from=builder /usr/src/k8s-cleaner/target/release/k8s-cleaner k8s-cleaner
 CMD ["./k8s-cleaner"]