chore(docs): update migration notes (#10829)

Please read [contributing guidelines](CONTRIBUTING.md) and remove this
line.

docs/docs/migration_notes.md

@@ -6,7 +6,7 @@ keywords: [sandbox, aztec, notes, migration, updating, upgrading]
 
 Aztec is in full-speed development. Literally every version breaks compatibility with the previous ones. This page attempts to target errors and difficulties you might encounter when upgrading, and how to resolve them.
 
-## 0.68.0
+## 0.67.1
 
 ### Noir contracts package no longer exposes artifacts as default export