Bump shakapacker from 6.6.0 to 8.4.0

Bumps [shakapacker](https://github.com/shakacode/shakapacker) from 6.6.0 to 8.4.0.
- [Changelog](https://github.com/shakacode/shakapacker/blob/main/CHANGELOG.md)
- [Commits](shakacode/shakapacker@v6.6.0...v8.4.0)

---
updated-dependencies:
- dependency-name: shakapacker
  dependency-version: 8.4.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile

@@ -53,7 +53,7 @@ gem 'simple_form'
 gem 'tinymce-rails'
 gem 'image_processing', '~> 1.14'
 gem 'react-rails'
-gem 'shakapacker', '~> 6.6'
+gem 'shakapacker', '~> 8.4'
 
 gem 'sidekiq'
 

Gemfile.lock

@@ -124,7 +124,7 @@ GEM
       erubi (>= 1.0.0)
       rack (>= 0.9.0)
       rouge (>= 1.0.0)
-    bigdecimal (3.2.2)
+    bigdecimal (3.2.3)
     bindex (0.8.1)
     binding_of_caller (1.0.1)
       debug_inspector (>= 1.2.0)
@@ -152,7 +152,7 @@ GEM
       logger (~> 1.5)
     coderay (1.1.3)
     concurrent-ruby (1.3.5)
-    connection_pool (2.5.3)
+    connection_pool (2.5.4)
     countries (7.1.1)
       unaccent (~> 0.3)
     country_select (10.0.1)
@@ -367,6 +367,7 @@ GEM
       rack
     orm_adapter (0.5.0)
     ostruct (0.6.1)
+    package_json (0.1.0)
     paper_trail (16.0.0)
       activerecord (>= 6.1)
       request_store (~> 1.4)
@@ -386,7 +387,7 @@ GEM
     pundit (2.5.0)
       activesupport (>= 3.0.0)
     racc (1.8.1)
-    rack (3.2.0)
+    rack (3.2.1)
     rack-mini-profiler (3.3.1)
       rack (>= 1.2.0)
     rack-protection (4.1.1)
@@ -510,8 +511,9 @@ GEM
     semantic_range (3.1.0)
     sendgrid-ruby (6.7.0)
       ruby_http_client (~> 3.4)
-    shakapacker (6.6.0)
+    shakapacker (8.4.0)
       activesupport (>= 5.2)
+      package_json
       rack-proxy (>= 0.6.1)
       railties (>= 5.2)
       semantic_range (>= 2.3.0)
@@ -637,7 +639,7 @@ DEPENDENCIES
   selectize-rails
   selenium-webdriver
   sendgrid-ruby
-  shakapacker (~> 6.6)
+  shakapacker (~> 8.4)
   sidekiq
   simple_form
   timecop