test: throw on deprecation

[JustinBeckwith]

No description provided.

[stephenplusplus]

The system test told us about this one:

  1) SpeechSmokeTest v1p1beta1
       successfully makes a call to the service:
     DeprecationWarning: grpc.load: Use the @grpc/proto-loader module with grpc.loadPackageDefinition instead
      at GrpcClient.load (node_modules\google-gax\src\grpc.ts:224:27)
      at new OperationsClientBuilder (node_modules\google-gax\src\operations_client.ts:440:38)
      at new lro (node_modules\google-gax\src\index.ts:58:10)
      at new SpeechClient (src\v1p1beta1\speech_client.js:122:29)
      at Context.done (system-test\speech_smoke_test_v1p1beta1.js:21:18)

[JustinBeckwith]

Ahh, then over to @alexander-fenster with this one since it's related to gax.

[StatusQuo]

Is there a chance to get this fix into the next version? :)

[codecov]

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