Update favicons

These have been upgraded in GOV.UK Frontend.

app/views/layouts/application.html.erb

@@ -10,12 +10,11 @@
     <%= tag :meta, name: 'viewport', content: 'width=device-width, initial-scale=1' %>
     <%= tag :meta, property: 'og:image', content: asset_path('images/govuk-opengraph-image.png') %>
     <%= tag :meta, name: 'theme-color', content: '#0b0c0c' %>
-    <%= favicon_link_tag asset_path('images/favicon.ico') %>
-    <%= favicon_link_tag asset_path('images/govuk-mask-icon.svg'), rel: 'mask-icon', type: 'image/svg', color: "#0b0c0c" %>
-    <%= favicon_link_tag asset_path('images/govuk-apple-touch-icon.png'), rel: 'apple-touch-icon', type: 'image/png' %>
-    <%= favicon_link_tag asset_path('images/govuk-apple-touch-icon-152x152.png'), rel: 'apple-touch-icon', type: 'image/png', size: '152x152' %>
-    <%= favicon_link_tag asset_path('images/govuk-apple-touch-icon-167x167.png'), rel: 'apple-touch-icon', type: 'image/png', size: '167x167' %>
-    <%= favicon_link_tag asset_path('images/govuk-apple-touch-icon-180x180.png'), rel: 'apple-touch-icon', type: 'image/png', size: '180x180' %>
+
+    <%= favicon_link_tag image_path('images/favicon.ico'), type: nil, sizes: "48x48" %>
+    <%= favicon_link_tag image_path('images/favicon.svg'), type: 'image/svg+xml', sizes: "any" %>
+    <%= favicon_link_tag image_path('images/govuk-icon-mask.svg'), rel: 'mask-icon', color: "#0b0c0c", type: nil %>
+    <%= favicon_link_tag image_path('images/govuk-icon-180.png'), rel: 'apple-touch-icon', type: nil %>
 
     <%= stylesheet_link_tag "application" %>
     <%= javascript_include_tag "application", defer: true %>