gax grpc exception on startup after upgrade to mn 3.0.3

[meyerinj]

Expected Behavior

Cloud application should start

Actual Behaviour

Cloud application fails to start with exception Message: getTransportChannel() called when needsExecutor() is true

Steps To Reproduce

• New Micronaut application with version 3.0.3
• Add a bootstrap.yml
• An environment variable GOOGLE_APPLICATION_CREDENTIALS pointing to valid google credentials
• Add the dependency io.micronaut.gcp:micronaut-gcp-secret-manager

Environment Information

Issue has been seen in Windows in JDK 1.8, 11, and 12 and Micronaut 3.0.3

Example Application

https://github.com/meyerinj/gcp-secret-bug

Version

3.0.3