Update Dockerfile to use Ubuntu 24.04 and PHP 8.3

Author: mrrobot47

Dockerfile

@@ -1,15 +1,13 @@
-# ubuntu:latest as of 2023-11-15T09:52:14.989810029UTC
-FROM ubuntu@sha256:2b7412e6465c3c7fc5bb21d3e6f1917c167358449fecac8176c6e496e5c1f05f
-
+FROM ubuntu:24.04
 LABEL "com.github.actions.icon"="check-circle"
 LABEL "com.github.actions.color"="green"
 LABEL "com.github.actions.name"="PHPCS Code Review"
 LABEL "com.github.actions.description"="Run automated code review using PHPCS on your pull requests."
 LABEL "org.opencontainers.image.source"="https://github.com/rtCamp/action-phpcs-code-review"
 
 ARG VAULT_VERSION=1.12.3
-ARG DEFAULT_PHP_VERSION=8.1
-ARG PHP_BINARIES_TO_PREINSTALL='7.4 8.0 8.1 8.2'
+ARG DEFAULT_PHP_VERSION=8.3
+ARG PHP_BINARIES_TO_PREINSTALL='7.4 8.0 8.1 8.2 8.3'
 
 ENV DOCKER_USER=rtbot
 ENV ACTION_WORKDIR=/home/$DOCKER_USER