Update antora.yml to 2026.03 (#341)

Author: NataliaIvakina

antora.yml

@@ -1,15 +1,15 @@
 name: java-reference
 title: Java Reference
-version: '2026.02'
+version: '2026.03'
 start_page: ROOT:index.adoc
 nav:
 - modules/ROOT/content-nav.adoc
 asciidoc:
   attributes:
-    neo4j-version: '2026.02'
-    neo4j-version-exact: '2026.02.0'
-    neo4j-buildnumber: '2026.02'
-    java-driver-version: '6.0.2'
+    neo4j-version: '2026.03'
+    neo4j-version-exact: '2026.03.0'
+    neo4j-buildnumber: '2026.03'
+    java-driver-version: '6.0.3'
     neo4j-documentation-branch: 'dev'
     page-origin-private: false
     neo4j-javadocs-base-uri: "{neo4j-docs-base-uri}/java-reference/{neo4j-version}/javadocs"