Bump to the next docs version

Co-authored-by: Paul Horn <[email protected]>

Author: Mats-SX

doc/antora.yml

@@ -1,12 +1,12 @@
 name: graph-data-science
 title: Neo4j Graph Data Science
-version: '2.11-preview'
+version: '2.12-preview'
 start_page: ROOT:index.adoc
 nav:
 - modules/ROOT/content-nav.adoc
 asciidoc:
   attributes:
-    docs-version: '2.11'
+    docs-version: '2.12'
     ga-promos-uri: https://raw.githubusercontent.com/neo4j-graphacademy/courses/main/asciidoc/promos
     ga-promo: analytics
     page-ad-icon: mortarboard
@@ -15,4 +15,3 @@ asciidoc:
     page-ad-link: https://graphacademy.neo4j.com/categories/analytics/?ref=docs-ad-analytics
     page-ad-underline-role: button
     page-ad-underline: Enroll now
-