[Bug]: Cannot sign using cloudkms: since v0.30.1

[GBBx]

Steps to Reproduce

I use step-cli 0.29.0 with step-kms-plugin 0.16.1. I can sign certificates like this:

step certificate sign   --kms "cloudkms:"  \
  --not-after 1h \
  example.csr \
  intermediate.crt   "projects/..." > example.crt

However, if I update step-cli to 0.30.1 (keeping step-kms-plugin 0.16.1) and execute the same command I get this message:

Error: cloudkms: does not implement a CertificateManager

Your Environment

• OS - Linux
• step CLI Version - 0.30.1

Expected Behavior

I should be able to sign the same way as with the previous version.

Actual Behavior

I get an error message with the newer version.

Additional Context

No response

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