chore(deps): update io_bazel_rules_docker commit hash to 251f6a6

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
io_bazel_rules_docker	http_archive	digest	`` -> 251f6a6

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PR has been edited

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[nlopezgi]

/ok-to-test

[k8s-ci-robot]

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