fix: use endpoint object

Signed-off-by: Matthias Pichler <m.pichler@warrify.com>

Author: matthias-pichler

examples/mock-service-extension.yaml

@@ -22,4 +22,5 @@ do:
     call: http
     with:
       method: get
-      endpoint: https://fake.com/sample
+      endpoint: 
+        uri: https://fake.com/sample