Followup to https://github.com/grpc/grpc/pull/35934
Trying to fix:
```
Required ruby-3.0.0 is not installed.
To install do: 'rvm install "ruby-3.0.0"'
```
Closes #35948
COPYBARA_INTEGRATE_REVIEW=https://github.com/grpc/grpc/pull/35948 from apolcyn:fix_ri
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