update supported ruby verison (#76)

(refs: #75)

Author: taichi-ishitani

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['3.3', '3.2', '3.1', '3.0']
+        ruby: ['3.4', '3.3', '3.2', '3.1']
     env:
       BUNDLE_WITH: 'development_common development_test'
       BUNDLE_WITHOUT: 'development_lint development_local'

.rubocop.yml

@@ -2,7 +2,7 @@ inherit_from:
   - .rubocop_todo.yml
 
 AllCops:
-  TargetRubyVersion: 3.0
+  TargetRubyVersion: 3.1
   Exclude:
     - spec/**/*
     - sample/**/*

flgen.gemspec

@@ -24,5 +24,5 @@ Gem::Specification.new do |spec|
   spec.bindir = 'exe'
   spec.executables = `git ls-files -- exe/*`.split($RS).map(&File.method(:basename))
   spec.require_paths = ['lib']
-  spec.required_ruby_version = '>= 3.0'
+  spec.required_ruby_version = '>= 3.1'
 end