Update the version to 4.4.40

Author: renetapopova

antora.yml

@@ -7,6 +7,6 @@ nav:
 asciidoc:
   attributes:
     neo4j-version: '4.4'
-    neo4j-version-exact: '4.4.39'
+    neo4j-version-exact: '4.4.40'
     neo4j-buildnumber: '4.4'
-    neo4j-debian-package-version: 1:4.4.39@
+    neo4j-debian-package-version: 1:4.4.40@