fix docker file to use correct ruby version

Dockerfile

@@ -1,7 +1,7 @@
 # syntax = docker/dockerfile:1
 
 # Make sure RUBY_VERSION matches the Ruby version in .ruby-version and Gemfile
-ARG RUBY_VERSION=3.2.2
+ARG RUBY_VERSION=3.3.5
 FROM ruby:$RUBY_VERSION-slim AS base
 
 LABEL fly_launch_runtime="rails"