Bump sass-rails from 5.0.7 to 6.0.0

Bumps [sass-rails](https://github.com/rails/sass-rails) from 5.0.7 to 6.0.0.
- [Release notes](https://github.com/rails/sass-rails/releases)
- [Commits](rails/sass-rails@v5.0.7...v6.0.0)

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

Gemfile

@@ -19,7 +19,7 @@ gem 'rails', '~> 5.2.3'
 gem 'rails-i18n'
 gem 'rails_bootstrap_navbar'
 gem 'btgen', git: 'https://github.com/bustikiller/btgen', branch: 'master'
-gem 'sass-rails', '~> 5.0'
+gem 'sass-rails', '~> 6.0'
 gem 'simple_form'
 gem 'turbolinks', '~> 5'
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]

Gemfile.lock

@@ -222,20 +222,17 @@ GEM
       rubocop (>= 0.68.1)
     ruby-progressbar (1.10.1)
     ruby_http_client (3.3.0)
-    sass (3.7.3)
-      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 (5.0.7)
-      railties (>= 4.0.0, < 6)
-      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 (2.0.0)
       ffi (~> 1.9.6)
       rake
+    sassc-rails (2.1.2)
+      railties (>= 4.0.0)
+      sassc (>= 2.0)
+      sprockets (> 3.0)
+      sprockets-rails
+      tilt
     sendgrid-ruby (5.3.0)
       ruby_http_client (~> 3.3.0)
       sinatra (>= 1.4.7, < 3)
@@ -251,7 +248,7 @@ GEM
     spring-watcher-listen (2.0.1)
       listen (>= 2.7, < 4.0)
       spring (>= 1.2, < 3.0)
-    sprockets (3.7.2)
+    sprockets (4.0.0)
       concurrent-ruby (~> 1.0)
       rack (> 1, < 3)
     sprockets-rails (3.2.1)
@@ -261,7 +258,7 @@ GEM
     sqlite3 (1.4.1)
     thor (0.20.3)
     thread_safe (0.3.6)
-    tilt (2.0.8)
+    tilt (2.0.10)
     turbolinks (5.2.1)
       turbolinks-source (~> 5.2)
     turbolinks-source (5.2.0)
@@ -312,7 +309,7 @@ DEPENDENCIES
   rspec_junit_formatter
   rubocop
   rubocop-rspec
-  sass-rails (~> 5.0)
+  sass-rails (~> 6.0)
   sendgrid-ruby
   simple_form
   spring