Update dependency sass-rails to v6

Gemfile

@@ -10,7 +10,7 @@ gem "pg"
 # Use Puma as the app server
 gem "puma"
 # Use SCSS for stylesheets
-gem "sass-rails", "~> 5"
+gem "sass-rails", "~> 6"
 # Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker
 gem "webpacker"
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder

Gemfile.lock

@@ -257,17 +257,16 @@ GEM
       rubocop-ast (>= 1.31.1, < 2.0)
     ruby-progressbar (1.13.0)
     rubyzip (2.3.2)
-    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
     selenium-webdriver (4.26.0)
       base64 (~> 0.2)
       logger (~> 1.4)
@@ -282,10 +281,9 @@ GEM
     spring-watcher-listen (2.1.0)
       listen (>= 2.7, < 4.0)
       spring (>= 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)
@@ -354,7 +352,7 @@ DEPENDENCIES
   rails (~> 6.1.6)
   rspec-rails
   rspec_junit_formatter
-  sass-rails (~> 5)
+  sass-rails (~> 6)
   selenium-webdriver
   simple_form
   spring