python: Remove outdated vaas_url

Author: GermanCoding

python/examples/VaasExample/authentication_example.py

@@ -6,12 +6,9 @@
 
 async def main():
     token_url = os.getenv("TOKEN_URL")
-    vaas_url = os.getenv("VAAS_URL")
 
     if token_url is None:
         token_url = "https://account.gdata.de/realms/vaas-production/protocol/openid-connect/token"
-    if vaas_url is None:
-        vaas_url = "wss://gateway.production.vaas.gdatasecurity.de"
 
     # If you got a username and password from us, you can use the ResourceOwnerPasswordAuthenticator like this
     if USE_RESOURCE_OWNER_PASSWORD_GRANT_AUTHENTICATOR: