Update to 5.26.12 (#2569)

Author: NataliaIvakina

antora.yml

@@ -10,6 +10,6 @@ asciidoc:
   attributes:
     neo4j-version: '5'
     neo4j-version-minor: '5.26'
-    neo4j-version-exact: '5.26.11'
+    neo4j-version-exact: '5.26.12'
     neo4j-buildnumber: '5.26'
     neo4j-debian-package-version: '1:5.22.0@'