This is not possible as it is a default behavior.
When any user wants to run the flow, he/she will be asked to authorize the connections you are using in your flow. Some connections will be authorized automatically, while other connections require users to take extra steps so that the flow works as expected.
This is like a precautionary action to make sure the user trying to run the flow should have access to all the connections used in Microsoft flow (and it is connected at time the time of running flow).
It is better to authorize the connections before flow runs than getting your flow failed after it runs.
See more at, Authentication failures.
In many cases, flows fail because of an authentication error. If you have this type of error, the error message contains Unauthorized or an error code of 401 or 403 appears. You can usually fix an authentication error by updating the connection.