fix: add link to neo4j release notes (#8406)

lib/datasource/metadata.ts

@@ -53,6 +53,7 @@ const manualChangelogUrls = {
       'https://gitlab.com/gitlab-org/omnibus-gitlab/-/blob/master/CHANGELOG.md',
     'gitlab/gitlab-runner':
       'https://gitlab.com/gitlab-org/gitlab-runner/-/blob/master/CHANGELOG.md',
+    neo4j: 'https://neo4j.com/release-notes/',
   },
 };