Bump sass-rails from 5.0.6 to 6.0.0

Bumps [sass-rails](https://github.com/rails/sass-rails) from 5.0.6 to 6.0.0.
- [Release notes](https://github.com/rails/sass-rails/releases)
- [Commits](rails/sass-rails@v5.0.6...v6.0.0)

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

Author: dependabot-preview[bot]

Gemfile

@@ -21,7 +21,7 @@ gem 'puma'
 gem 'rack-canonical-host'
 gem 'rails', '~> 4.2'
 gem 'recipient_interceptor'
-gem 'sass-rails', '~> 5.0'
+gem 'sass-rails', '~> 6.0'
 gem 'simple_form'
 gem 'telegram-bot-ruby'
 gem 'title'

Gemfile.lock

@@ -107,6 +107,7 @@ GEM
       railties (>= 3.0.0)
     faraday (0.15.4)
       multipart-post (>= 1.2, < 3)
+    ffi (1.12.2)
     flutie (2.0.0)
     formulaic (0.4.1)
       activesupport
@@ -144,7 +145,7 @@ GEM
       sass (>= 3.3)
     newrelic_rpm (6.9.0.363)
     nio4r (2.5.2)
-    nokogiri (1.10.8)
+    nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
     normalize-rails (3.0.3)
     pg (0.20.0)
@@ -193,6 +194,9 @@ GEM
       rake (>= 0.8.7)
       thor (>= 0.18.1, < 2.0)
     rake (13.0.1)
+    rb-fsevent (0.10.3)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
     recipient_interceptor (0.2.0)
       mail
     refills (0.2.0)
@@ -215,13 +219,21 @@ GEM
       rspec-support (~> 3.9.0)
     rspec-support (3.9.2)
     safe_yaml (1.0.5)
-    sass (3.4.24)
-    sass-rails (5.0.6)
-      railties (>= 4.0.0, < 6)
-      sass (~> 3.1)
-      sprockets (>= 2.8, < 4.0)
-      sprockets-rails (>= 2.0, < 4.0)
-      tilt (>= 1.1, < 3)
+    sass (3.7.4)
+      sass-listen (~> 4.0.0)
+    sass-listen (4.0.0)
+      rb-fsevent (~> 0.9, >= 0.9.4)
+      rb-inotify (~> 0.9, >= 0.9.7)
+    sass-rails (6.0.0)
+      sassc-rails (~> 2.1, >= 2.1.1)
+    sassc (2.2.1)
+      ffi (~> 1.9)
+    sassc-rails (2.1.2)
+      railties (>= 4.0.0)
+      sassc (>= 2.0)
+      sprockets (> 3.0)
+      sprockets-rails
+      tilt
     shoulda-matchers (4.1.2)
       activesupport (>= 4.2.0)
     simple_form (4.0.0)
@@ -235,7 +247,7 @@ GEM
     spring (2.1.0)
     spring-commands-rspec (1.0.4)
       spring (>= 0.9.1)
-    sprockets (3.7.2)
+    sprockets (4.0.0)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.1)
@@ -248,7 +260,7 @@ GEM
       virtus
     thor (0.20.3)
     thread_safe (0.3.6)
-    tilt (2.0.7)
+    tilt (2.0.10)
     timecop (0.9.1)
     title (0.0.7)
       i18n
@@ -310,7 +322,7 @@ DEPENDENCIES
   recipient_interceptor
   refills
   rspec-rails (~> 3.9.0)
-  sass-rails (~> 5.0)
+  sass-rails (~> 6.0)
   shoulda-matchers
   simple_form
   simplecov