chore: update version to v0.5.1

Author: github-actions[bot]

book/quarto/index.qmd

@@ -7,7 +7,7 @@ format:
     date-format: long
     # Version is automatically updated by publish-live.yml workflow
     # Links to releases page via assets/scripts/version-link.js
-    doi: "v0.6.0"
+    doi: "v0.5.1"
     doi-title: "Version"
     author:
       name: Vijay Janapa Reddi