Remove versions set by snyk and update Rails

Gemfile

@@ -5,11 +5,11 @@ gem 'bootstrap-will_paginate'
 gem 'carrierwave'
 gem 'concurrent-ruby'
 gem 'docker-api', require: 'docker'
-gem 'factory_bot_rails', '>= 5.0.1'
+gem 'factory_bot_rails'
 gem 'forgery'
 gem 'highline'
 gem 'jbuilder'
-gem 'jquery-rails', '>= 4.3.3'
+gem 'jquery-rails'
 gem 'ims-lti', '< 2.0.0'
 gem 'kramdown'
 gem 'newrelic_rpm'
@@ -17,14 +17,14 @@ gem 'pg'
 gem 'pry-byebug'
 gem 'puma'
 gem 'pundit'
-gem 'rails', '5.2.2.1'
-gem 'rails-i18n', '>= 5.1.3'
+gem 'rails', '5.2.3'
+gem 'rails-i18n'
 gem 'i18n-js'
-gem 'ransack', '>= 2.1.1'
+gem 'ransack'
 gem 'rubytree'
-gem 'sass-rails', '>= 5.0.7'
-gem 'slim-rails', '>= 3.2.0'
-gem 'pagedown-bootstrap-rails', '>= 2.1.4'
+gem 'sass-rails'
+gem 'slim-rails'
+gem 'pagedown-bootstrap-rails'
 gem 'sorcery'
 gem 'turbolinks'
 gem 'uglifier'
@@ -32,12 +32,12 @@ gem 'tubesock', git: 'https://github.com/gosukiwi/tubesock', branch: 'patch-1' #
 gem 'faye-websocket'
 gem 'eventmachine', '1.0.9.1' # explicitly added, this is used by faye-websocket, newer versions might crash or
 gem 'nokogiri'
-gem 'webpacker', '>= 4.0.2'
+gem 'webpacker'
 gem 'rest-client'
 gem 'rubyzip'
 gem 'mnemosyne-ruby'
 gem 'whenever', require: false
-gem 'rails-timeago', '>= 2.17.1'
+gem 'rails-timeago'
 
 group :development, :staging do
   gem 'bootsnap', require: false
@@ -52,7 +52,7 @@ group :development, :staging do
   gem 'rack-mini-profiler'
   gem 'rubocop', require: false
   gem 'rubocop-rspec'
-  gem 'web-console', '>= 3.7.0'
+  gem 'web-console'
 end
 
 group :development, :test, :staging do
@@ -60,7 +60,7 @@ group :development, :test, :staging do
 end
 
 group :test do
-  gem 'rails-controller-testing', '>= 1.0.4'
+  gem 'rails-controller-testing'
   gem 'autotest-rails'
   gem 'capybara'
   gem 'selenium-webdriver'
@@ -68,6 +68,6 @@ group :test do
   gem 'database_cleaner'
   gem 'nyan-cat-formatter'
   gem 'rspec-autotest'
-  gem 'rspec-rails', '>= 3.8.2'
+  gem 'rspec-rails'
   gem 'simplecov', require: false
 end