Update dependency sass-rails to v6

Gemfile

@@ -9,7 +9,7 @@ gem 'rails', '~> 6.1.0', '>= 6.1.7.8'
 gem 'pg'
 
 # Use SCSS for stylesheets
-gem 'sass-rails', '~> 5.1.0'
+gem 'sass-rails', '~> 6.0.0'
 
 # Use jquery as the JavaScript library
 gem 'jquery-rails'

Gemfile.lock

@@ -279,17 +279,16 @@ GEM
     rufus-scheduler (3.9.1)
       fugit (~> 1.1, >= 1.1.6)
     rugged (1.7.2)
-    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 (5.1.0)
-      railties (>= 5.2.0)
-      sass (~> 3.1)
-      sprockets (>= 2.8, < 4.0)
-      sprockets-rails (>= 2.0, < 4.0)
-      tilt (>= 1.1, < 3)
+    sass-rails (6.0.0)
+      sassc-rails (~> 2.1, >= 2.1.1)
+    sassc (2.4.0)
+      ffi (~> 1.9)
+    sassc-rails (2.1.2)
+      railties (>= 4.0.0)
+      sassc (>= 2.0)
+      sprockets (> 3.0)
+      sprockets-rails
+      tilt
     sawyer (0.8.2)
       addressable (>= 2.3.5)
       faraday (> 0.8, < 2.0)
@@ -311,10 +310,9 @@ GEM
       simplecov_json_formatter (~> 0.1)
     simplecov-html (0.12.3)
     simplecov_json_formatter (0.1.4)
-    sprockets (3.7.5)
-      base64
+    sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
-      rack (> 1, < 3)
+      rack (>= 2.2.4, < 4)
     sprockets-rails (3.5.2)
       actionpack (>= 6.1)
       activesupport (>= 6.1)
@@ -370,7 +368,7 @@ DEPENDENCIES
   rspec
   rspec-rails
   rugged
-  sass-rails (~> 5.1.0)
+  sass-rails (~> 6.0.0)
   sidecloq
   sidekiq
   simplecov (>= 0.21.2)