Fix upstream nullability on entity equipment getters (#6519)

patches/api/0053-Fix-upstream-javadocs.patch

@@ -31,6 +31,50 @@ index 1d13a4c289e6a764b3b080455a86e17a5e60929e..294b6092b438ad3d09bf3ad28d08ffdf
       *
       * @return an array containing all previous players
       */
+diff --git a/src/main/java/org/bukkit/entity/ArmorStand.java b/src/main/java/org/bukkit/entity/ArmorStand.java
+index 91fc11dda99de506be83d40df8929bf7cd8e8d85..7dc631ebd009f5f5c3ac1699c3f3515c47609c05 100644
+--- a/src/main/java/org/bukkit/entity/ArmorStand.java
++++ b/src/main/java/org/bukkit/entity/ArmorStand.java
+@@ -360,5 +360,8 @@ public interface ArmorStand extends LivingEntity {
+      * @param move {@code true} if this armour stand can move, {@code false} otherwise
+      */
+     void setCanMove(boolean move);
++
++    @Override
++    org.bukkit.inventory.@NotNull EntityEquipment getEquipment();
+     // Paper end
+ }
+diff --git a/src/main/java/org/bukkit/entity/HumanEntity.java b/src/main/java/org/bukkit/entity/HumanEntity.java
+index db4ba67618d29f72d695c66c27d771795565a1d0..0ab94ddd3b88eee8040233a89823bd2fadc78d55 100644
+--- a/src/main/java/org/bukkit/entity/HumanEntity.java
++++ b/src/main/java/org/bukkit/entity/HumanEntity.java
+@@ -21,6 +21,11 @@ import org.jetbrains.annotations.Nullable;
+  */
+ public interface HumanEntity extends LivingEntity, AnimalTamer, InventoryHolder {
+ 
++    // Paper start
++    @Override
++    org.bukkit.inventory.@NotNull EntityEquipment getEquipment();
++    // Paper end
++
+     /**
+      * Returns the name of this player
+      *
+diff --git a/src/main/java/org/bukkit/entity/Mob.java b/src/main/java/org/bukkit/entity/Mob.java
+index be9334a8b5fba9181ad63c211697e798be63da25..0514a141cb93a650be38c63d4336d46e4304f4b6 100644
+--- a/src/main/java/org/bukkit/entity/Mob.java
++++ b/src/main/java/org/bukkit/entity/Mob.java
+@@ -8,6 +8,10 @@ import org.jetbrains.annotations.Nullable;
+  */
+ public interface Mob extends LivingEntity, Lootable {
+ 
++    // Paper start
++    @Override
++    org.bukkit.inventory.@org.jetbrains.annotations.NotNull EntityEquipment getEquipment();
++    // Paper end
+     /**
+      * Instructs this Mob to set the specified LivingEntity as its target.
+      * <p>
 diff --git a/src/main/java/org/bukkit/entity/Player.java b/src/main/java/org/bukkit/entity/Player.java
 index 9d5c5b5f7d7ae4f0278410833d9d385242872498..2301a5c6ada86b63b1c0207a6d89b0da4c167bbb 100644
 --- a/src/main/java/org/bukkit/entity/Player.java