fix api nullability

patches/api/0490-New-and-Improved-Lidded-API.patch

@@ -77,12 +77,14 @@ index 0000000000000000000000000000000000000000..ea775e7cd28b68e520d1381eee8c732f
 +}
 diff --git a/src/main/java/io/papermc/paper/block/Lidded.java b/src/main/java/io/papermc/paper/block/Lidded.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..b75f79695d898c0d02968bb2c10af6255bac63d8
+index 0000000000000000000000000000000000000000..b432f070e1689b0a0c65ca8015760c8b24c4769f
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/block/Lidded.java
-@@ -0,0 +1,33 @@
+@@ -0,0 +1,39 @@
 +package io.papermc.paper.block;
 +
++import org.jetbrains.annotations.NotNull;
++
 +public interface Lidded {
 +
 +    /**
@@ -90,12 +92,14 @@ index 0000000000000000000000000000000000000000..b75f79695d898c0d02968bb2c10af625
 +     *
 +     * @return the effective lid state
 +     */
++    @NotNull
 +    LidState getEffectiveLidState();
 +
 +    /**
 +     * Gets how the lid would be without any lidded mode, based on players interacting with the block.
 +     * @return the true lid state
 +     */
++    @NotNull
 +    LidState getTrueLidState();
 +
 +    /**
@@ -103,6 +107,7 @@ index 0000000000000000000000000000000000000000..b75f79695d898c0d02968bb2c10af625
 +     *
 +     * @return the lid mode
 +     */
++    @NotNull
 +    LidMode getLidMode();
 +
 +    /**
@@ -111,7 +116,8 @@ index 0000000000000000000000000000000000000000..b75f79695d898c0d02968bb2c10af625
 +     * @param mode the new lid mode
 +     * @return the actually set lid mode
 +     */
-+    LidMode setLidMode(LidMode mode);
++    @NotNull
++    LidMode setLidMode(@NotNull LidMode mode);
 +
 +}
 diff --git a/src/main/java/org/bukkit/block/Barrel.java b/src/main/java/org/bukkit/block/Barrel.java