Update com_github_grpc_grpc commit hash to dcb3b03

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
com_github_grpc_grpc	http_archive	digest	`` -> dcb3b03

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[k8s-ci-robot]

Hi @renovate-bot. Thanks for your PR.

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[smukherj1]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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