Update required_ruby_version to 3.1

Signed-off-by: Samuel Giddins <segiddins@segiddins.me>

Author: segiddins

.rubocop-bundler.yml

@@ -2,7 +2,7 @@ inherit_from:
   - .rubocop_todo.yml
 
 AllCops:
-  TargetRubyVersion: 3.0
+  TargetRubyVersion: 3.1
   Exclude:
     - tmp/**/*
     - lib/bundler/vendor/**/*

compact_index.gemspec

@@ -20,5 +20,5 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.metadata["rubygems_mfa_required"] = "true"
-  spec.required_ruby_version = ">= 3.0.0"
+  spec.required_ruby_version = ">= 3.1.0"
 end