We were getting a ton of deprecation warnings:
```
DEPRECATION WARNING: `Rails.application.secrets` is deprecated in favor
of `Rails.application.credentials` and will be removed in Rails 7.2
```
However, we don't plan to replace the secrets with credentials in the
foreseeable future because it would affect existing Consul Democracy
installations, so for now we're simply silencing the warnings.
ce62da1f88