simulators/ethereum/engine: Increase engine timeouts

[spencer-tb]

A simple PR to increase engine timeout values.

Some tests on the hive cancun public interface occasionally fail with the context deadline exceeded error. That is they pass most of the time but on occasion fail with this error.

1. For the engine-cancun tests we have the following case that occurs waiting for an FCU response. The proposed solution is to increase the RPC timeout from 10 seconds to 20.
2. For the pyspec tests we have this case where we timeout waiting for the engine client to start. I have seen this occur randomly across most clients. The proposed solution is to increase the engine live check timeout from 5 seconds to 10.

Unfortunately these cases can't be reproduced locally as they are for tests that always pass when running locally.

[marioevz]

LGTM thanks!

Just btw, it could be that the context timeout (for the total max time of the test runtime) happens right when we are requesting from the client's RPC, so it might be that it's not that the specific request is taking too much to process, but that the test has already taken too long to complete.