Update upload endpoint for C++

Author: GermanCoding

.github/workflows/ci-cpp.yaml

@@ -28,7 +28,7 @@ on:
 env:
   CLIENT_ID: ${{ secrets.CLIENT_ID }}
   CLIENT_SECRET: ${{secrets.CLIENT_SECRET}}
-  VAAS_URL: "https://upload.production.vaas.gdatasecurity.de"
+  VAAS_URL: "https://gateway.production.vaas.gdatasecurity.de"
   TOKEN_URL: "https://account.gdata.de/realms/vaas-production/protocol/openid-connect/token"
   VAAS_CLIENT_ID: ${{ secrets.VAAS_CLIENT_ID }}
   VAAS_USER_NAME: ${{ secrets.VAAS_USER_NAME }}