[chore] Revert examples back to putting warbler/jruby-jars in the development group

Otherwise there can be weird require issues at runtime.

(cherry picked from commit bb98ac0)

Author: chadlwilson

examples/camping/Gemfile

@@ -5,5 +5,7 @@ ruby '~> 3.1.0'
 gem 'camping'
 gem 'rack', '~> 2.2'
 
-gem 'warbler', '~> 2.1'
-gem 'jruby-jars', '< 10'
+group :development do
+  gem 'warbler', '~> 2.1'
+  gem 'jruby-jars', '< 10'
+end

examples/rails7/Gemfile

@@ -1,10 +1,12 @@
 source 'https://rubygems.org'
 
-ruby '~> 3.1.0'
+ruby '~> 3.4.0'
 
 gem 'rails', '~> 7.2.0'
 gem 'rack', '~> 2.2'
 gem 'sprockets-rails'
 
-gem 'warbler', '~> 2.1'
-gem 'jruby-jars', '< 10'
+group :development do
+  gem 'warbler', '~> 2.1'
+  gem 'jruby-jars', '< 10'
+end

examples/sinatra/Gemfile

@@ -5,5 +5,7 @@ ruby '~> 3.1.0'
 gem 'sinatra'
 gem 'rack', '~> 2.2'
 
-gem 'warbler', '~> 2.1'
-gem 'jruby-jars', '< 10'
+group :development do
+  gem 'warbler', '~> 2.1'
+  gem 'jruby-jars', '< 10'
+end