regenerate gems, pin sqlite3 (we can upgrade it after we upgrade rails), and fix some upgrade errors

Gemfile

@@ -114,7 +114,7 @@ gem 'binding_of_caller' # see has_changelog.rb
 
 group :test, :development do
   gem 'pry'
-  gem 'sqlite3'
+  gem 'sqlite3', '~> 1.4'
   
   # Call 'byebug' anywhere in the code to stop execution and get a debugger console
   gem 'byebug', platforms: [:mri, :mingw, :x64_mingw]

app/jobs/cache_attribute_word_count_job.rb

@@ -5,6 +5,11 @@ class CacheAttributeWordCountJob < ApplicationJob
     attribute_id = args.shift
     attribute    = Attribute.find_by(id: attribute_id)
 
+    # If the attribute has been deleted since this job was enqueued, just bail
+    if attribute.nil?
+      return
+    end
+
     # If we have a blank/null value, ezpz 0 words
     if attribute.nil? || attribute.value.nil? || attribute.value.blank?
       attribute.update_column(:word_count_cache, 0)

app/models/page_collections/page_collection.rb

@@ -13,7 +13,7 @@ class PageCollection < ApplicationRecord
   has_one_attached :header_image, dependent: :destroy
   validates :header_image, attached: false,
     content_type: {
-      in: ['image/png', 'image/jpg', 'image/jpeg', 'image/gif'],
+      in: ['image/png', 'image/jpeg', 'image/gif'],
       message: 'must be a PNG, JPG, JPEG, or GIF'
     },
     dimension: { 

app/models/users/user.rb

@@ -97,7 +97,7 @@ class User < ApplicationRecord
   has_one_attached :avatar
   validates :avatar, attached: false,
     content_type: {
-      in: ['image/png', 'image/jpg', 'image/jpeg', 'image/gif'],
+      in: ['image/png', 'image/jpeg', 'image/gif'],
       message: 'must be a PNG, JPG, JPEG, or GIF'
     },
     dimension: { 

bin/webpack-dev-server

@@ -7,6 +7,7 @@ require "pathname"
 ENV["BUNDLE_GEMFILE"] ||= File.expand_path("../../Gemfile",
   Pathname.new(__FILE__).realpath)
 
+require_relative "../config/boot"
 require "bundler/setup"
 
 require "webpacker"

config/boot.rb

@@ -1,4 +1,5 @@
 ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../Gemfile', __dir__)
 
+require "logger" # Fix concurrent-ruby removing logger dependency which Rails itself does not have
 require 'bundler/setup'  # Set up gems listed in the Gemfile.
 # require 'bootsnap/setup' # Speed up boot time by caching expensive operations.