fix dockerfile

Author: Lgdev07

Dockerfile

@@ -1,5 +1,5 @@
-# Using hexpm/elixir:1.11.4-erlang-23.2.7.2-alpine-3.13.3 as the base image
-FROM hexpm/elixir:1.11.4-erlang-23.2.7.2-alpine-3.13.3 AS base
+# Using hexpm/elixir:1.18.0-otp-26-alpine-3.18.0 as the base image
+FROM elixir:1.18.3-otp-27-slim AS base
 
 # Set the working directory in the container
 WORKDIR /code_comparison