Bump webpacker from 3.5.5 to 5.1.1

Bumps [webpacker](https://github.com/rails/webpacker) from 3.5.5 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/v3.5.5...v5.1.1)

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

Gemfile

@@ -29,7 +29,7 @@ gem 'sass-rails', '~> 5.0'
 gem 'slack-notifier', '~> 2.3.2'
 gem 'turbolinks', '~> 5'
 gem 'uglifier', '>= 1.3.0'
-gem 'webpacker', '~> 3.5'
+gem 'webpacker', '~> 5.1'
 
 group :test do
   gem 'capybara', '~> 2.18'

Gemfile.lock

@@ -81,7 +81,7 @@ GEM
       autoprefixer-rails (>= 6.0.3)
       popper_js (>= 1.12.9, < 2)
       sass (>= 3.5.2)
-    builder (3.2.3)
+    builder (3.2.4)
     bullet (5.9.0)
       activesupport (>= 3.0.0)
       uniform_notifier (~> 1.11)
@@ -100,10 +100,10 @@ GEM
     chromedriver-helper (2.1.1)
       archive-zip (~> 0.10)
       nokogiri (~> 1.8)
-    concurrent-ruby (1.1.5)
+    concurrent-ruby (1.1.6)
     crack (0.4.3)
       safe_yaml (~> 1.0.0)
-    crass (1.0.4)
+    crass (1.0.6)
     daredevil (0.0.2)
       rails (>= 4.2.8)
     delayed_job (4.1.5)
@@ -127,7 +127,7 @@ GEM
       activesupport (>= 5.0)
       request_store (>= 1.0)
     encryptor (3.0.0)
-    erubi (1.8.0)
+    erubi (1.9.0)
     execjs (2.7.0)
     factory_bot (5.0.2)
       activesupport (>= 4.2.0)
@@ -146,7 +146,7 @@ GEM
       bootstrap (~> 4.1.3)
       rails (>= 4.2.0)
       sass-rails
-    i18n (1.6.0)
+    i18n (1.8.2)
       concurrent-ruby (~> 1.0)
     io-like (0.3.0)
     jmespath (1.3.1)
@@ -168,7 +168,7 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.7)
       ruby_dep (~> 1.2)
     local_time (2.1.0)
-    loofah (2.2.3)
+    loofah (2.5.0)
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     mail (2.7.1)
@@ -176,11 +176,11 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     metaclass (0.0.4)
-    method_source (0.9.2)
+    method_source (1.0.0)
     mimemagic (0.3.3)
     mini_mime (1.0.1)
     mini_portile2 (2.4.0)
-    minitest (5.11.3)
+    minitest (5.14.0)
     minitest-capybara (0.8.2)
       capybara (~> 2.2)
       minitest (~> 5.0)
@@ -201,16 +201,16 @@ GEM
       metaclass (~> 0.0.1)
     msgpack (1.2.9)
     nio4r (2.3.1)
-    nokogiri (1.10.4)
+    nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
     pg (1.1.4)
     popper_js (1.14.5)
     public_suffix (4.0.1)
     puma (3.12.1)
-    rack (2.0.7)
+    rack (2.2.2)
     rack-cors (1.0.3)
-    rack-proxy (0.6.4)
+    rack-proxy (0.6.5)
       rack
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -230,15 +230,15 @@ GEM
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.0.4)
-      loofah (~> 2.2, >= 2.2.2)
+    rails-html-sanitizer (1.3.0)
+      loofah (~> 2.3)
     railties (5.2.3)
       actionpack (= 5.2.3)
       activesupport (= 5.2.3)
       method_source
       rake (>= 0.8.7)
       thor (>= 0.19.0, < 2.0)
-    rake (12.3.2)
+    rake (13.0.1)
     rb-fsevent (0.10.3)
     rb-inotify (0.10.0)
       ffi (~> 1.0)
@@ -265,6 +265,7 @@ GEM
     selenium-webdriver (3.141.0)
       childprocess (~> 0.5)
       rubyzip (~> 1.2, >= 1.2.2)
+    semantic_range (2.3.0)
     slack-notifier (2.3.2)
     spring (2.0.2)
       activesupport (>= 4.2)
@@ -284,7 +285,7 @@ GEM
     turbolinks (5.2.0)
       turbolinks-source (~> 5.2)
     turbolinks-source (5.2.0)
-    tzinfo (1.2.5)
+    tzinfo (1.2.7)
       thread_safe (~> 0.1)
     uglifier (4.1.20)
       execjs (>= 0.3.0, < 3)
@@ -301,10 +302,11 @@ GEM
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
-    webpacker (3.5.5)
-      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)
     websocket-driver (0.7.0)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.3)
@@ -353,7 +355,7 @@ DEPENDENCIES
   vcr (~> 5.0)
   web-console (>= 3.3.0)
   webmock (~> 3.7)
-  webpacker (~> 3.5)
+  webpacker (~> 5.1)
 
 BUNDLED WITH
    1.16.4