Update docker images to Ubuntu latest (#2862)

## Issue Addressed

- Resolves #2778

## Proposed Changes

Updates docker images from Buster (10) to Bullseye (11), since Bullseye is [listed](https://www.debian.org/releases/) as the "current stable release".

## Additional Info

NA

lcli/Dockerfile

@@ -8,6 +8,6 @@ ARG PORTABLE
 ENV PORTABLE $PORTABLE
 RUN cd lighthouse && make install-lcli
 
-FROM debian:buster-slim
+FROM ubuntu:latest
 RUN apt-get update && apt-get -y upgrade && apt-get clean && rm -rf /var/lib/apt/lists/*
 COPY --from=builder /usr/local/cargo/bin/lcli /usr/local/bin/lcli