Update discord link in the paper.yml (#4646)

Spigot-Server-Patches/0002-Paper-config-files.patch

@@ -306,7 +306,7 @@ index 0000000000000000000000000000000000000000..68d3cb02dbfdc9d6f9d3682a2659c943
 +            + "If you need help with the configuration or have any questions related to Paper,\n"
 +            + "join us in our Discord or IRC channel.\n"
 +            + "\n"
-+            + "Discord: https://paperdiscord.emc.gs\n"
++            + "Discord: https://discord.gg/papermc\n"
 +            + "IRC: #paper @ irc.spi.gt ( http://irc.spi.gt/iris/?channels=paper )\n"
 +            + "Website: https://papermc.io/ \n"
 +            + "Docs: https://paper.readthedocs.org/ \n";