fix(wkhtmltopdf): heroku gem did not work, so try using apt

Aptfile

+wkhtmltopdf
+libssl1.0.0

Gemfile

@@ -57,7 +57,6 @@ gem 'webpacker'
 gem 'wicked_pdf'
 gem 'will_paginate'
 gem 'will-paginate-i18n'
-gem 'wkhtmltopdf-heroku'
 
 group :development do
   gem 'debase', require: false
@@ -74,7 +73,6 @@ group :development do
   gem 'rubocop-rails', require: false
   gem 'ruby-debug-ide', require: false
   gem 'ruby-lint', require: false
-  gem 'wkhtmltopdf-binary'
 end
 
 group :development, :test do
@@ -87,6 +85,7 @@ group :development, :test do
   gem 'pry-byebug'
   gem 'pry-stack_explorer'
   gem 'spring'
+  gem 'wkhtmltopdf-binary'
 end
 
 group :test do

Gemfile.lock

@@ -543,7 +543,6 @@ GEM
     will-paginate-i18n (0.1.15)
     will_paginate (3.3.0)
     wkhtmltopdf-binary (0.12.5.4)
-    wkhtmltopdf-heroku (2.12.6.0)
     xpath (3.2.0)
       nokogiri (~> 1.8)
     zeitwerk (2.4.2)
@@ -635,7 +634,6 @@ DEPENDENCIES
   will-paginate-i18n
   will_paginate
   wkhtmltopdf-binary
-  wkhtmltopdf-heroku
 
 RUBY VERSION
    ruby 2.6.6p146