Update the base image to Ubuntu 24.04

Update the base image to Ubuntu 24.04 from 22.04.

Dockerfile

@@ -1,5 +1,5 @@
 #syntax=docker/dockerfile:1.7-labs
-FROM ubuntu:22.04 AS build
+FROM ubuntu:24.04 AS build
 
 # Install build dependencies in a single layer to reduce the number of image layers.
 RUN apt-get update && \
@@ -16,7 +16,7 @@ COPY ./ core-rs-albatross
 RUN cd core-rs-albatross && \
     cargo build --release
 
-FROM ubuntu:22.04
+FROM ubuntu:24.04
 
 # Install dependencies in a single layer to reduce the number of image layers.
 RUN apt-get update && \
@@ -25,7 +25,7 @@ RUN apt-get update && \
 
 # Run as an unprivileged user, combining commands to reduce layers.
 RUN groupadd --system --gid 1001 nimiq && \
-    adduser --system --home /home/nimiq --uid 1001 --gid 1001 nimiq
+    useradd --system --home /home/nimiq --uid 1001 --gid 1001 nimiq
 
 # Switch to the unprivileged user and set working directory in one layer.
 USER nimiq