Bump webpacker from 4.3.0 to 5.4.3 (#77)

Bumps [webpacker](https://github.com/rails/webpacker) from 4.3.0 to 5.4.3.
- [Release notes](https://github.com/rails/webpacker/releases)
- [Changelog](https://github.com/rails/webpacker/blob/master/CHANGELOG.md)
- [Commits](rails/webpacker@v4.3.0...v5.4.3)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile

@@ -12,7 +12,7 @@ gem 'puma', '~> 5.5'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5'
 # Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker
-gem 'webpacker', '~> 4.0'
+gem 'webpacker', '~> 5.4'
 # Turbolinks makes navigating your web application faster. Read more: https://github.com/turbolinks/turbolinks
 gem 'turbolinks', '~> 5'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder

Gemfile.lock

@@ -155,7 +155,7 @@ GEM
       nio4r (~> 2.0)
     racc (1.6.0)
     rack (2.2.3)
-    rack-proxy (0.6.5)
+    rack-proxy (0.7.2)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -221,6 +221,7 @@ GEM
       childprocess (>= 0.5, < 5.0)
       rexml (~> 3.2, >= 3.2.5)
       rubyzip (>= 1.2.2)
+    semantic_range (3.0.0)
     spring (2.1.1)
     spring-watcher-listen (2.0.1)
       listen (>= 2.7, < 4.0)
@@ -249,10 +250,11 @@ GEM
       nokogiri (~> 1.6)
       rubyzip (>= 1.3.0)
       selenium-webdriver (> 3.141, < 5.0)
-    webpacker (4.3.0)
-      activesupport (>= 4.2)
+    webpacker (5.4.3)
+      activesupport (>= 5.2)
       rack-proxy (>= 0.6.1)
-      railties (>= 4.2)
+      railties (>= 5.2)
+      semantic_range (>= 2.3.0)
     websocket-driver (0.7.4)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)
@@ -286,7 +288,7 @@ DEPENDENCIES
   turbolinks (~> 5)
   web-console (>= 3.3.0)
   webdrivers
-  webpacker (~> 4.0)
+  webpacker (~> 5.4)
 
 RUBY VERSION
    ruby 2.7.4p191