Fix creepers being able to blow up watered blocks

sakura-server/minecraft-patches/sources/net/minecraft/world/entity/monster/Creeper.java.patch

@@ -0,0 +1,16 @@
+--- a/net/minecraft/world/entity/monster/Creeper.java
++++ b/net/minecraft/world/entity/monster/Creeper.java
+@@ -250,7 +_,12 @@
+             if (!event.isCancelled()) {
+             // CraftBukkit end
+             this.dead = true;
+-            serverLevel.explode(this, this.getX(), this.getY(), this.getZ(), event.getRadius(), event.getFire(), Level.ExplosionInteraction.MOB); // CraftBukkit // Paper - fix DamageSource API (revert to vanilla, no, just no, don't change this)
++            // Sakura start - fix creepers blowing up watered blocks
++            // Entities can clip up to 1.0e-7 inside blocks which can be abused to cegg watered blocks.
++            // This is patched by adding a slight offset to the explosion position.
++            final double explosionY = this.getY() + 1.0e-5;
++            serverLevel.explode(this, this.getX(), explosionY, this.getZ(), event.getRadius(), event.getFire(), Level.ExplosionInteraction.MOB); // CraftBukkit // Paper - fix DamageSource API (revert to vanilla, no, just no, don't change this)
++            // Sakura end - fix creepers blowing up watered blocks
+             this.spawnLingeringCloud();
+             this.triggerOnDeathMobEffects(serverLevel, Entity.RemovalReason.KILLED);
+             this.discard(org.bukkit.event.entity.EntityRemoveEvent.Cause.EXPLODE); // CraftBukkit - add Bukkit remove cause