[#555] Update Cardano Node to version 8.9.0

The Cardano Node version has been updated to 8.9.0 to align with the latest configuration requirements specified on https://book.world.dev.cardano.org. This update was necessary as the existing configuration was found to be incompatible with previous version 8.8.0-pre, requiring an intermediate update to ensure the proper functioning of the Cardano Node.

scripts/govtool/Makefile

@@ -7,7 +7,7 @@ include config.mk
 .DEFAULT_GOAL := info
 
 # image tags
-cardano_node_image_tag := 8.8.0-pre
+cardano_node_image_tag := 8.9.0
 cardano_db_sync_image_tag := sancho-4.1.0
 
 .PHONY: all