Add new emojis from jdecked/twemoji 15.0 (#28404)

lib/tasks/emojis.rake

@@ -45,7 +45,7 @@ end
 namespace :emojis do
   desc 'Generate a unicode to filename mapping'
   task :generate do
-    source = 'http://www.unicode.org/Public/emoji/14.0/emoji-test.txt'
+    source = 'http://www.unicode.org/Public/emoji/15.0/emoji-test.txt'
     codes  = []
     dest   = Rails.root.join('app', 'javascript', 'mastodon', 'features', 'emoji', 'emoji_map.json')
 
@@ -91,8 +91,8 @@ namespace :emojis do
   desc 'Generate emoji variants with white borders'
   task :generate_borders do
     src = Rails.root.join('app', 'javascript', 'mastodon', 'features', 'emoji', 'emoji_map.json')
-    emojis_light = '👽⚾🐔☁️💨🕊️👀🍥👻🐐❕❔⛸️🌩️🔊🔇📃🌧️🐏🍚🍙🐓🐑💀☠️🌨️🔉🔈💬💭🏐🏳️⚪⬜◽◻️▫️'
-    emojis_dark = '🎱🐜⚫🖤⬛◼️◾◼️✒️▪️💣🎳📷📸♣️🕶️✴️🔌💂‍♀️📽️🍳🦍💂🔪🕳️🕹️🕋🖊️🖋️💂‍♂️🎤🎓🎥🎼♠️🎩🦃📼📹🎮🐃🏴🐞🕺📱📲🚲'
+    emojis_light = '👽⚾🐔☁️💨🕊️👀🍥👻🐐❕❔⛸️🌩️🔊🔇📃🌧️🐏🍚🍙🐓🐑💀☠️🌨️🔉🔈💬💭🏐🏳️⚪⬜◽◻️▫️🪽🪿'
+    emojis_dark = '🎱🐜⚫🖤⬛◼️◾◼️✒️▪️💣🎳📷📸♣️🕶️✴️🔌💂‍♀️📽️🍳🦍💂🔪🕳️🕹️🕋🖊️🖋️💂‍♂️🎤🎓🎥🎼♠️🎩🦃📼📹🎮🐃🏴🐞🕺📱📲🚲🪮🐦‍⬛'
 
     map = Oj.load(File.read(src))