lambda: fix unboundLocalError in lambda (#46729)

This fix initializes current_version to None so that
module proceeds in check mode.

Fixes: #46654

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

lib/ansible/modules/cloud/amazon/lambda.py

@@ -554,6 +554,7 @@ def main():
                                               'SecurityGroupIds': vpc_security_group_ids}})
 
         # Finally try to create function
+        current_version = None
         try:
             if not check_mode:
                 response = client.create_function(**func_kwargs)