Updated link to OpenApi

Author: JohannesRabauer

openapi/INFO.md

@@ -1,4 +1,6 @@
-This ``openapi.yml`` is based on the [official available one](https://www.bzst.de/SharedDocs/Downloads/DE/EOP_BOP/dip_open_api.yaml) with minor modifications.
+This ``openapi.yml`` is based on
+the [official available one](https://www.bzst.de/SharedDocs/Downloads/EN/EOP_BOP/dip_open_api_zip_version_2_1.7z?__blob=publicationFile&v=3)
+with minor modifications.
 
 The Java API Client can be generated using ``mvn clean compile -P openapi-generator`` inside [``bzst-dip-java-client``](../bzst-dip-java-client/).