DEV: Capture output in hashtags spec (#20773)

lib/tasks/hashtags.rake

@@ -6,10 +6,10 @@ task "hashtags:mark_old_format_for_rebake" => :environment do
   # on a schedule.
   puts "Finding posts matching old format, this could take some time..."
   posts_to_rebake = Post.where("cooked like '%class=\"hashtag\"%'")
-  STDOUT.puts(
+  puts(
     "[!] You are about to mark #{posts_to_rebake.count} posts containing hashtags in the old format to rebake. [CTRL+c] to cancel, [ENTER] to continue",
   )
   STDIN.gets.chomp if !Rails.env.test?
   posts_to_rebake.update_all(baked_version: 0)
-  puts "Done, rebakes will happen when periodal updates job runs."
+  puts "Done, rebakes will happen when periodical updates job runs."
 end

spec/tasks/hashtags_spec.rb

@@ -24,7 +24,7 @@ RSpec.describe "tasks/hashtags" do
       post_3 = Fabricate(:post, raw: "This is a cool #support hashtag")
       SiteSetting.enable_experimental_hashtag_autocomplete = false
 
-      Rake::Task["hashtags:mark_old_format_for_rebake"].invoke
+      capture_stdout { Rake::Task["hashtags:mark_old_format_for_rebake"].invoke }
 
       [post_1, post_2, post_3].each(&:reload)