chore(deps): update io_bazel_rules_docker commit hash to 31c38b0

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
io_bazel_rules_docker	http_archive	digest	9f7f04d -> 31c38b0

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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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[rbe-toolchains-pr-bot]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alex1545, renovate-bot

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