Player: ditch deprecated dataPacket()

it doesn't make sense to deprecate this on a major version, particularly given all the other changes that plugin devs will have to accommodate.

src/player/Player.php

@@ -1917,18 +1917,6 @@ class Player extends Human implements CommandSender, ChunkLoader, ChunkListener,
 		return $this->networkSession->sendDataPacket($packet, $immediate);
 	}
 
-	/**
-	 * @deprecated This is a proxy for sendDataPacket() and will be removed in the next major release.
-	 * @see Player::sendDataPacket()
-	 *
-	 * @param ClientboundPacket $packet
-	 *
-	 * @return bool
-	 */
-	public function dataPacket(ClientboundPacket $packet) : bool{
-		return $this->sendDataPacket($packet, false);
-	}
-
 	/**
 	 * Adds a title text to the user's screen, with an optional subtitle.
 	 *