Update upstream B/CB/S

--- work/Bukkit
Submodule work/Bukkit 3aee9dbd0..0828ce366:
  > Add SpawnReason.SHEARING
  > SPIGOT-4339: Add EntityTransformEvent

--- work/CraftBukkit
Submodule work/CraftBukkit 17ff1e046..c2035aa1d:
  > Add some missing CreatureSpawnEvent.SpawnReason calls
  > SPIGOT-4339: Add EntityTransformEvent

--- work/Spigot
Submodule work/Spigot 947a8e7fd..5696c83c1:
  > Rebuild patches

Spigot-API-Patches/EntityTransformedEvent.patch

@@ -6,7 +6,7 @@ Subject: [PATCH] EntityTransformedEvent
 
 diff --git a/src/main/java/com/destroystokyo/paper/event/entity/EntityTransformedEvent.java b/src/main/java/com/destroystokyo/paper/event/entity/EntityTransformedEvent.java
 new file mode 100644
-index 000000000..d9e5cab95
+index 00000000..12194f1f
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/event/entity/EntityTransformedEvent.java
 @@ -0,0 +0,0 @@
@@ -17,12 +17,15 @@ index 000000000..d9e5cab95
 +import org.bukkit.event.Cancellable;
 +import org.bukkit.event.HandlerList;
 +import org.bukkit.event.entity.EntityEvent;
++import org.bukkit.event.entity.EntityTransformEvent;
 +
 +/**
 + * Fired when an entity transforms into another entity
 + * <p>
 + * If the event is cancelled, the entity will not transform
++ * @deprecated Bukkit has added {@link EntityTransformEvent}, you should start using that
 + */
++@Deprecated
 +public class EntityTransformedEvent extends EntityEvent implements Cancellable {
 +    private static final HandlerList handlers = new HandlerList();
 +    private boolean cancelled;
@@ -39,14 +42,18 @@ index 000000000..d9e5cab95
 +     * The entity after it has transformed
 +     *
 +     * @return Transformed entity
++     * @deprecated see {@link EntityTransformEvent#getTransformedEntity()}
 +     */
++    @Deprecated
 +    public Entity getTransformed() {
 +        return transformed;
 +    }
 +
 +    /**
 +     * @return The reason for the transformation
++     * @deprecated see {@link EntityTransformEvent#getTransformReason()}
 +     */
++    @Deprecated
 +    public TransformedReason getReason() {
 +        return reason;
 +    }