Bump Ruby from 2.7 to 3.0

Although 3.0.5 was released the other day, there's not a Docker image
available for it yet for fly.io.

References:
- https://quay.io/repository/evl.ms/fullstaq-ruby?tab=tags&tag=latest
- https://circleci.com/developer/images/image/cimg/ruby

.circleci/config.yml

@@ -5,7 +5,7 @@ version: 2.1
 jobs:
   run-tests:
     docker:
-      - image: cimg/ruby:2.7.5-node
+      - image: cimg/ruby:3.0.4-node
         environment:
           RAILS_ENV: test
           PGHOST: 127.0.0.1

.ruby-version

@@ -1 +1 @@
-2.7.5
+3.0.4

Dockerfile

@@ -17,7 +17,7 @@
 # We recommend using the highest patch level for better security and
 # performance.
 
-ARG RUBY_VERSION=2.7.5
+ARG RUBY_VERSION=3.0.4
 ARG VARIANT=jemalloc-slim
 FROM quay.io/evl.ms/fullstaq-ruby:${RUBY_VERSION}-${VARIANT} as base
 

Gemfile

@@ -1,7 +1,7 @@
 source 'https://rubygems.org'
 git_source(:github) { |_repo| "https://github.com/#{repo}.git" }
 
-ruby '2.7.5'
+ruby '3.0.4'
 
 gem 'autoprefixer-rails'
 gem 'bootsnap', '>= 1.4.2', require: false

Gemfile.lock

@@ -282,7 +282,7 @@ DEPENDENCIES
   webpacker (~> 4.0)
 
 RUBY VERSION
-   ruby 2.7.5p203
+   ruby 3.0.4p208
 
 BUNDLED WITH
-   2.3.19
+   2.3.26