gRPC service extension examples won't run

[jonashelgemo]

Describe the issue
Dapr API in the Python SDK has changed, documentation examples do not run and gives errors

URL of the docs
This example fails: https://docs.dapr.io/developing-applications/sdks/python/python-sdk-extensions/python-grpc/#listen-for-service-invocation-requests

Expected content

from dapr.ext.grpc import App, InvokeMethodRequest, InvokeMethodResponse

app = App()

@app.method(name='my-method')
def mymethod(request: InvokeServiceRequest) -> InvokeServiceResponse:
    print(request.metadata, flush=True)
    print(request.text(), flush=True)

    return InvokeServiceResponse(b'INVOKE_RECEIVED', "text/plain; charset=UTF-8")

app.run(50051)

Screenshots

Additional context
Seems to be correct in master: https://github.com/dapr/python-sdk/blob/master/examples/invoke-simple/invoke-receiver.py, so might be resolved when version is bumped

[AaronCrawfis]

Fixed by #1553