Gems/Yarn: bump webpack and webpack-dev-server

Gemfile

@@ -13,7 +13,7 @@ gem "puma", "~> 5.6"
 gem 'sd_notify', '>= 0.1.0'
 
 # Webpacker
-gem 'webpacker', '~> 4.x'
+gem 'webpacker', '~> 5.x'
 
 gem 'sqlite3', '~> 1.4'
 #gem 'mysql2', '~> 0.5.0'

Gemfile.lock

@@ -181,11 +181,6 @@ GEM
     capybara-selenium (0.0.6)
       capybara
       selenium-webdriver
-    carrierwave (1.3.4)
-      activemodel (>= 4.0.0)
-      activesupport (>= 4.0.0)
-      mime-types (>= 1.16)
-      ssrf_filter (~> 1.0, < 1.1.0)
     chartkick (5.0.5)
     chosen-rails (1.10.0)
       coffee-rails (>= 3.2)
@@ -655,6 +650,7 @@ GEM
       rexml (~> 3.2, >= 3.2.5)
       rubyzip (>= 1.2.2, < 3.0)
       websocket (~> 1.0)
+    semantic_range (3.0.0)
     shrine (3.5.0)
       content_disposition (~> 1.0)
       down (~> 5.1)
@@ -684,7 +680,6 @@ GEM
       sprockets (>= 3.0.0)
     sqlite3 (1.7.0)
       mini_portile2 (~> 2.8.0)
-    ssrf_filter (1.0.8)
     stackprof (0.2.25)
     statesman (10.0.0)
     temple (0.10.3)
@@ -741,10 +736,11 @@ GEM
       activemodel (>= 6.0.0)
       bindex (>= 0.4.0)
       railties (>= 6.0.0)
-    webpacker (4.3.0)
-      activesupport (>= 4.2)
+    webpacker (5.4.4)
+      activesupport (>= 5.2)
       rack-proxy (>= 0.6.1)
-      railties (>= 4.2)
+      railties (>= 5.2)
+      semantic_range (>= 2.3.0)
     websocket (1.2.10)
     websocket-driver (0.7.6)
       websocket-extensions (>= 0.1.0)
@@ -776,7 +772,6 @@ DEPENDENCIES
   capybara
   capybara-screenshot
   capybara-selenium
-  carrierwave (~> 1.2)
   chosen-rails (~> 1.10)
   chronic
   coffee-rails (~> 4.2)
@@ -839,7 +834,7 @@ DEPENDENCIES
   twitter-typeahead-rails (= 0.11.1.pre.corejavascript)
   uglifier (>= 1.3.0)
   web-console
-  webpacker (~> 4.x)
+  webpacker (~> 5.x)
   whenever (~> 1.0.0)
 
 BUNDLED WITH

package.json

@@ -21,7 +21,7 @@
     "@babel/core": "^7.7.2",
     "@babel/register": "^7.7.0",
     "shx": "^0.3.2",
-    "webpack-dev-server": "^3.9.0"
+    "webpack-dev-server": "^4.0"
   },
   "dependencies": {
     "@babel/cli": "^7.5.5",