Fix test failure caused by rails#52780

https://buildkite.com/rails/rails/builds/111223#0191e1f4-0419-4a3c-9cec-01067adfd283

Author: kamipo

railties/lib/rails/dev_caching.rb

@@ -15,7 +15,7 @@ def enable_by_file
           puts "Action Controller caching disabled for development mode."
         else
           create_cache_file
-          puts "Action Controller caching enabled for development mode"
+          puts "Action Controller caching enabled for development mode."
         end
 
         FileUtils.touch "tmp/restart.txt"

railties/test/commands/dev_test.rb

@@ -13,7 +13,7 @@ class Rails::Command::DevTest < ActiveSupport::TestCase
       assert_not File.exist?("tmp/restart.txt")
 
       assert_equal <<~OUTPUT, run_dev_cache_command
-        Development mode is now being cached.
+        Action Controller caching enabled for development mode.
       OUTPUT
 
       assert File.exist?("tmp/caching-dev.txt")
@@ -30,7 +30,7 @@ class Rails::Command::DevTest < ActiveSupport::TestCase
       restart_file_time_before = File.mtime("tmp/restart.txt")
 
       assert_equal <<~OUTPUT, run_dev_cache_command
-        Development mode is now being cached.
+        Action Controller caching enabled for development mode.
       OUTPUT
 
       assert File.exist?("tmp/caching-dev.txt")
@@ -49,7 +49,7 @@ class Rails::Command::DevTest < ActiveSupport::TestCase
       restart_file_time_before = File.mtime("tmp/restart.txt")
 
       assert_equal <<~OUTPUT, run_dev_cache_command
-        Development mode is no longer being cached.
+        Action Controller caching disabled for development mode.
       OUTPUT
 
       assert_not File.exist?("tmp/caching-dev.txt")