add slim-rails gem

Gemfile

@@ -56,4 +56,4 @@ end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem 'tzinfo-data', platforms: [:mingw, :mswin, :x64_mingw, :jruby]
-gem "slim"
+gem 'slim-rails', '~> 3.2'

Gemfile.lock

@@ -170,6 +170,10 @@ GEM
     slim (4.1.0)
       temple (>= 0.7.6, < 0.9)
       tilt (>= 2.0.6, < 2.1)
+    slim-rails (3.2.0)
+      actionpack (>= 3.1)
+      railties (>= 3.1)
+      slim (>= 3.0, < 5.0)
     spring (2.1.1)
     sprockets (4.0.2)
       concurrent-ruby (~> 1.0)
@@ -224,7 +228,7 @@ DEPENDENCIES
   rails (~> 6.1.3, >= 6.1.3.2)
   sass-rails (~> 6.0)
   selenium-webdriver
-  slim
+  slim-rails (~> 3.2)
   spring
   sqlite3 (~> 1.4)
   turbolinks (~> 5)