fix: correct prev_git_tag

Author: simar7

mkdocs.yml

@@ -90,7 +90,7 @@ extra:
     provider: mike
     default: latest
   var:
-    prev_git_tag: "v0.27.2"
+    prev_git_tag: "v0.27.1"
     chart_version: "0.29.2"
   social:
     - icon: fontawesome/brands/twitter