Fix postal code in 2026 venue address

Author: vkrause

data/jsonld/event2026.json

@@ -12,7 +12,7 @@
       "@type": "PostalAddress",
       "addressCountry": "CH",
       "addressLocality": "Bern",
-      "postalCode": "13014",
+      "postalCode": "3014",
       "streetAddress": "Hilfikerstrasse 1"
     },
     "geo": {