Related to the deprecation of the gRPC gateway:
https://github.com/prysmaticlabs/prysm/pull/14089

Currently the `mix-with-tools.yaml` test was failing due to the
keymanager being enabled:

```
  == FINISHED SERVICE 'vc-2-nethermind-prysm' LOGS ===================================
  Caused by: An error occurred while waiting for all TCP and UDP ports to be open
  Caused by: Unsuccessful ports check for IP '172.16.0.34' and port spec '{privatePortSpec:0xc00091a0c0}', even after '240' retries with '500' milliseconds in between retries. Timeout '2m0s' has been reached
  Caused by: An error occurred while calling network address '172.16.0.34:5056' with port protocol 'TCP' and using time out '200ms'
  Caused by: dial tcp 172.16.0.34:5056: connect: connection refused

Error encountered running Starlark code.
```