Update the version number to 4.4.43 (#1277)

Author: NataliaIvakina

antora.yml

@@ -8,4 +8,4 @@ asciidoc:
   attributes:
     neo4j-major-version: '4'
     neo4j-version: '4.4'
-    neo4j-version-exact: '4.4.42'
+    neo4j-version-exact: '4.4.43'