Update the exact version to 5.26-LTS (#1931)

Author: renetapopova

antora.yml

@@ -7,7 +7,7 @@ nav:
 asciidoc:
   attributes:
     neo4j-version: '5'
-    neo4j-version-minor: '5.25'
-    neo4j-version-exact: '5.25.0'
-    neo4j-buildnumber: '5.25'
+    neo4j-version-minor: '5.26'
+    neo4j-version-exact: '5.26.0'
+    neo4j-buildnumber: '5.26'
     neo4j-debian-package-version: '1:5.22.0@'