Bump webpacker from 5.4.0 to 5.4.2 (#14561)

Bumps [webpacker](https://github.com/rails/webpacker) from 5.4.0 to 5.4.2.
- [Release notes](https://github.com/rails/webpacker/releases)
- [Changelog](https://github.com/rails/webpacker/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rails/webpacker/compare/v5.4.0...v5.4.2)

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

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

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

Gemfile

@@ -114,7 +114,7 @@ gem "validate_url", "~> 1.0" # Library for validating urls in Rails
 gem "vault", "~> 0.16" # Used to store secrets
 gem "view_component", "~> 2.38", require: "view_component/engine" # View components for Rails
 gem "wcag_color_contrast", "~> 0.1" # Detect contrast of colors to determine readability and a11y.
-gem "webpacker", "~> 5.4.0" # Use webpack to manage app-like JavaScript modules in Rails
+gem "webpacker", "~> 5.4.2" # Use webpack to manage app-like JavaScript modules in Rails
 
 group :development do
   gem "better_errors", "~> 2.9" # Provides a better error page for Rails and other Rack apps

Gemfile.lock

@@ -539,7 +539,7 @@ GEM
       rack
     rack-protection (2.1.0)
       rack
-    rack-proxy (0.6.5)
+    rack-proxy (0.7.0)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -820,7 +820,7 @@ GEM
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
-    webpacker (5.4.0)
+    webpacker (5.4.2)
       activesupport (>= 5.2)
       rack-proxy (>= 0.6.1)
       railties (>= 5.2)
@@ -995,7 +995,7 @@ DEPENDENCIES
   web-console (~> 4.1)
   webdrivers (~> 4.6)
   webmock (~> 3.14)
-  webpacker (~> 5.4.0)
+  webpacker (~> 5.4.2)
   yard (~> 0.9.26)
   yard-activerecord (~> 0.0.16)
   yard-activesupport-concern (~> 0.0.1)