chore(deps): update io_bazel_rules_docker commit hash to 6a3ef0d

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
io_bazel_rules_docker	http_archive	digest	cd7ddbe -> 6a3ef0d

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[k8s-ci-robot]

Hi @renovate-bot. Thanks for your PR.

I'm waiting for a bazelbuild member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[alex1545]

/ok-to-test

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[k8s-ci-robot]

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