chore: bump React on Rails to v16.0.0 and Shakapacker to v8.4.0

- Update react_on_rails gem from 14.1.0.rc.0 to 16.0.0
- Update shakapacker gem from 8.0.0 to 8.4.0
- Update react-on-rails npm package from 14.0.3 to 16.0.0
- Update shakapacker npm package from 8.0.0 to 8.4.0
- Update Ruby version from 3.3.4 to 3.3.7
- Add migration plan document

Author: ihabadham

.ruby-version

@@ -1 +1 @@
-3.3.4
+3.3.7

Gemfile

@@ -3,10 +3,10 @@
 source "https://rubygems.org"
 git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
-ruby "3.3.4"
+ruby "3.3.7"
 
-gem "react_on_rails", "14.2.1"
-gem "shakapacker", "8.0.0"
+gem "react_on_rails", "16.0.0"
+gem "shakapacker", "8.4.0"
 
 # Bundle edge Rails instead: gem "rails", github: "rails/rails"
 gem "listen"

Gemfile.lock

@@ -298,12 +298,13 @@ GEM
     rdoc (6.14.2)
       erb
       psych (>= 4.0.0)
-    react_on_rails (14.2.1)
+    react_on_rails (16.0.0)
       addressable
       connection_pool
       execjs (~> 2.5)
       rails (>= 5.2)
       rainbow (~> 3.0)
+      shakapacker (>= 6.0)
     redcarpet (3.6.0)
     redis (5.3.0)
       redis-client (>= 0.22.0)
@@ -388,7 +389,7 @@ GEM
       websocket (~> 1.0)
     semantic_range (3.1.0)
     sexp_processor (4.17.1)
-    shakapacker (8.0.0)
+    shakapacker (8.4.0)
       activesupport (>= 5.2)
       package_json
       rack-proxy (>= 0.6.1)
@@ -484,7 +485,7 @@ DEPENDENCIES
   rails-html-sanitizer
   rails_best_practices
   rainbow
-  react_on_rails (= 14.2.1)
+  react_on_rails (= 16.0.0)
   redcarpet
   redis (~> 5.0)
   rspec-rails (~> 6.0.0)
@@ -496,7 +497,7 @@ DEPENDENCIES
   scss_lint
   sdoc
   selenium-webdriver (~> 4)
-  shakapacker (= 8.0.0)
+  shakapacker (= 8.4.0)
   spring
   spring-commands-rspec
   stimulus-rails (~> 1.3)
@@ -505,7 +506,7 @@ DEPENDENCIES
   web-console
 
 RUBY VERSION
-   ruby 3.3.4p94
+   ruby 3.3.7p123
 
 BUNDLED WITH
    2.4.17