Finish converting all events to jspecify annotations

patches/api/Add-BlockPreDispenseEvent.patch

@@ -65,6 +65,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        this.cancelled = cancel;
 +    }
 +
++    @Override
 +    public HandlerList getHandlers() {
 +        return HANDLER_LIST;
 +    }