Bump webpacker from 4.2.2 to 5.1.1 (#13631)

Bumps [webpacker](https://github.com/rails/webpacker) from 4.2.2 to 5.1.1.
- [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/v4.2.2...v5.1.1)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Gemfile

@@ -97,7 +97,7 @@ gem 'tty-command', '~> 0.9', require: false
 gem 'tty-prompt', '~> 0.21', require: false
 gem 'twitter-text', '~> 1.14'
 gem 'tzinfo-data', '~> 1.2019'
-gem 'webpacker', '~> 4.2'
+gem 'webpacker', '~> 5.1'
 gem 'webpush'
 
 gem 'json-ld'

Gemfile.lock

@@ -564,6 +564,7 @@ GEM
       crass (~> 1.0.2)
       nokogiri (>= 1.8.0)
       nokogumbo (~> 2.0)
+    semantic_range (2.3.0)
     sidekiq (6.0.4)
       connection_pool (>= 2.2.2)
       rack (>= 2.0.0)
@@ -647,10 +648,11 @@ GEM
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
-    webpacker (4.2.2)
-      activesupport (>= 4.2)
+    webpacker (5.1.1)
+      activesupport (>= 5.2)
       rack-proxy (>= 0.6.1)
-      railties (>= 4.2)
+      railties (>= 5.2)
+      semantic_range (>= 2.3.0)
     webpush (0.3.8)
       hkdf (~> 0.2)
       jwt (~> 2.0)
@@ -790,5 +792,5 @@ DEPENDENCIES
   twitter-text (~> 1.14)
   tzinfo-data (~> 1.2019)
   webmock (~> 3.8)
-  webpacker (~> 4.2)
+  webpacker (~> 5.1)
   webpush