Fix more compile issues

patches/server/Optimize-Network-Manager-and-add-advanced-packet-sup.patch

@@ -345,14 +345,14 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    /**
 +     * @param player Null if not at PLAY stage yet
 +     */
-+    default void onPacketDispatch(@Nullable net.minecraft.server.level.ServerPlayer player) {
++    default void onPacketDispatch(@org.jetbrains.annotations.Nullable net.minecraft.server.level.ServerPlayer player) {
 +    }
 +
 +    /**
 +     * @param player Null if not at PLAY stage yet
 +     * @param future Can be null if packet was cancelled
 +     */
-+    default void onPacketDispatchFinish(@Nullable net.minecraft.server.level.ServerPlayer player, @Nullable io.netty.channel.ChannelFuture future) {}
++    default void onPacketDispatchFinish(@org.jetbrains.annotations.Nullable net.minecraft.server.level.ServerPlayer player, @org.jetbrains.annotations.Nullable io.netty.channel.ChannelFuture future) {}
 +
 +    default boolean hasFinishListener() {
 +        return false;
@@ -362,7 +362,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        return true;
 +    }
 +
-+    @Nullable
++    @org.jetbrains.annotations.Nullable
 +    default java.util.List<Packet<?>> getExtraPackets() {
 +        return null;
 +    }