Deprecate Player#boostElytra (#9899)

The Paper method was chosen for deprecation because it was more
restrictive in that it has an isGliding check.

patches/api/0371-Custom-Chat-Completion-Suggestions-API.patch

@@ -5,14 +5,14 @@ Subject: [PATCH] Custom Chat Completion Suggestions API
 
 
 diff --git a/src/main/java/org/bukkit/entity/Player.java b/src/main/java/org/bukkit/entity/Player.java
-index 6a53097f308955dc063daf96aa367c2cb2945ca1..470d47d6ffaf04805439d043fbb04bf2342d1db8 100644
+index 3d64f8c3071495ec95350e09843d8e140b6a9af3..58498426c6ec697091a7a8ceeae6b85525ef39b7 100644
 --- a/src/main/java/org/bukkit/entity/Player.java
 +++ b/src/main/java/org/bukkit/entity/Player.java
-@@ -2935,6 +2935,29 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
-      * @throws IllegalArgumentException If the level is negative or greater than {@code 4} (i.e. not within {@code [0, 4]}).
-      */
+@@ -2944,6 +2944,31 @@ public interface Player extends HumanEntity, Conversable, OfflinePlayer, PluginM
      void sendOpLevel(byte level);
-+
+     // Paper end - sendOpLevel API
+ 
++    // Paper start - custom chat completions API
 +    /**
 +     * Adds custom chat completion suggestions that the client will
 +     * suggest when typing in chat.
@@ -35,6 +35,8 @@ index 6a53097f308955dc063daf96aa367c2cb2945ca1..470d47d6ffaf04805439d043fbb04bf2
 +     */
 +    @Deprecated(since = "1.20.1")
 +    void removeAdditionalChatCompletions(@NotNull java.util.Collection<String> completions);
-     // Paper end
- 
++    // Paper end - custom chat completions API
++
      // Spigot start
+     public class Spigot extends Entity.Spigot {
+