Update Java driver to 5.28.6 (#283) (#284)

Author: NataliaIvakina

antora.yml

@@ -9,7 +9,7 @@ asciidoc:
     neo4j-version: '2025.05'
     neo4j-version-exact: '2025.05.0'
     neo4j-buildnumber: '2025.05'
-    java-driver-version: '5.28.5'
+    java-driver-version: '5.28.6'
     neo4j-documentation-branch: 'dev'
     page-origin-private: false
     neo4j-javadocs-base-uri: "https://neo4j.com/docs/java-reference/5/javadocs"