Update module docker/docker to v0.12.0

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
github.com/docker/docker	require	minor	v0.12.0	source

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Release Notes

docker/docker

v0.12.0

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v0.11.1

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v0.11.0

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v0.10.0

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v0.9.1

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v0.9.0

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v0.8.1

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v0.8.0

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v0.7.6

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v0.7.5

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v0.7.4

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