Move development dependencies into the Gemfile

Github Actions is not finding the dependencies otherwise

Gemfile

@@ -5,6 +5,21 @@ source 'https://rubygems.org'
 # Please see blacklight.gemspec for dependency information.
 gemspec path: File.expand_path('..', __FILE__)
 
+gem 'simplecov'
+gem 'engine_cart', '~> 2.1'
+gem 'rsolr', ">= 1.0.6", "< 3"
+gem "rspec-rails", "~> 6.1"
+gem "rspec-collection_matchers", ">= 1.0"
+gem 'axe-core-rspec'
+gem "capybara", '~> 3'
+gem 'selenium-webdriver'
+gem 'equivalent-xml'
+gem "rubocop", '~> 1.0'
+gem 'rubocop-rails'
+gem 'rubocop-rspec'
+gem 'i18n-tasks'
+gem 'solr_wrapper'
+
 group :test do
   gem 'activerecord-jdbcsqlite3-adapter', platform: :jruby
 end

blacklight.gemspec

@@ -32,19 +32,4 @@ Gem::Specification.new do |s|
   s.add_dependency "i18n", '>= 1.7.0' # added named parameters
   s.add_dependency "ostruct", '>= 0.3.2'
   s.add_dependency "view_component", '>= 2.66', '< 4'
-
-  s.add_development_dependency "rsolr", ">= 1.0.6", "< 3"  # Library for interacting with rSolr.
-  s.add_development_dependency "rspec-rails", "~> 6.1"
-  s.add_development_dependency "rspec-collection_matchers", ">= 1.0"
-  s.add_development_dependency 'axe-core-rspec'
-  s.add_development_dependency "capybara", '~> 3'
-  s.add_development_dependency 'selenium-webdriver'
-  s.add_development_dependency 'engine_cart', '~> 2.1'
-  s.add_development_dependency "equivalent-xml"
-  s.add_development_dependency "simplecov"
-  s.add_development_dependency "rubocop", '~> 1.0'
-  s.add_development_dependency "rubocop-rails"
-  s.add_development_dependency "rubocop-rspec"
-  s.add_development_dependency "i18n-tasks"
-  s.add_development_dependency "solr_wrapper"
 end