Fix typo in supported neo4j versions

Author: FlorentinD

doc/modules/ROOT/pages/installation/supported-neo4j-versions.adoc

@@ -10,7 +10,7 @@ Time to upgrade!
 [opts=header]
 |===
 | Neo4j version    | Neo4j Graph Data Science
-| `5.5`            | `2.3.2 or later`
+| `5.6`            | `2.3.2 or later`
 | `5.5`            | `2.3.1 or later`
 | `5.4`            | `2.3`, `2.2.7 or later` footnote:eol[This version series is end-of-life and will not receive further patches. Please use a later version.]
 | `5.3`            | `2.3`, `2.2.6 or later` footnote:eol[]