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[bot] <[email protected]>

Author: dependabot[bot]

Gemfile

@@ -34,7 +34,7 @@ gem "rack-timeout"
 gem "rails", "~> 5.0.0"
 gem "recipient_interceptor"
 gem "redcarpet"
-gem "sass-rails", "~> 5.0.1"
+gem "sass-rails", "~> 6.0.0"
 gem "select2-rails"
 gem "simple_form"
 gem "sprockets-rails", "~>3.0"

Gemfile.lock

@@ -665,6 +665,7 @@ GEM
     factory_girl_rails (4.4.1)
       factory_girl (~> 4.4.0)
       railties (>= 3.0.0)
+    ffi (1.13.0)
     flutie (2.0.0)
     foreman (0.74.0)
       dotenv (~> 0.11.1)
@@ -758,7 +759,7 @@ GEM
     pry-rails (0.3.2)
       pry (>= 0.9.10)
     public_suffix (4.0.3)
-    rack (2.1.1)
+    rack (2.2.2)
     rack-test (0.6.3)
       rack (>= 1.0)
     rack-timeout (0.0.4)
@@ -822,12 +823,16 @@ GEM
       sexp_processor (~> 4.9)
     safe_yaml (1.0.5)
     sass (3.2.19)
-    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 (2.3.0)
+      ffi (~> 1.9)
+    sassc-rails (2.1.2)
+      railties (>= 4.0.0)
+      sassc (>= 2.0)
+      sprockets (> 3.0)
+      sprockets-rails
+      tilt
     select2-rails (4.0.3)
       thor (~> 0.14)
     sexp_processor (4.13.0)
@@ -941,7 +946,7 @@ DEPENDENCIES
   recipient_interceptor
   redcarpet
   rspec-rails (~> 3.8)
-  sass-rails (~> 5.0.1)
+  sass-rails (~> 6.0.0)
   select2-rails
   shoulda-matchers (~> 2.7.0)
   simple_form