[#1538] Update Cardano DB Sync and Node versions

Upgraded the Cardano Node to version 9.0.0-sancho and Cardano DB Sync to
sancho-5.1.0 in the `scripts/govtool/Makefile`. This adjustment ensures
compatibility with the latest network protocols and incorporates recent
fixes and features. This change is essential for maintaining
synchronicity with the updated Cardano protocol and supports upcoming
governance functionalities. This commit paves the way for further
testing in staging environments, aiming to confirm stability and prevent
any major issues or downtime in the beta environment.

scripts/govtool/Makefile

@@ -10,8 +10,8 @@ include config.mk
 .DEFAULT_GOAL := info
 
 # image tags
-cardano_node_image_tag := 8.11.0-sancho
-cardano_db_sync_image_tag := sancho-4-3-0-docker
+cardano_node_image_tag := 9.0.0-sancho
+cardano_db_sync_image_tag := sancho-5.1.0
 
 .PHONY: all
 all: deploy-stack notify