Update sourcegraph/alpine Docker tag to v3.12 - autoclosed

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
sourcegraph/alpine	final	minor	3.12	source

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Release Notes

sourcegraph/sourcegraph

v3.12

This release backports the fixes released in 3.13.2 for customers still on 3.12.

Fixed

• The default timeout of indexed search has been increased. Previously indexed search would always return within 3s. This lead to broken behaviour on new instances which had yet to tune resource allocations. #​8720
• Bitbucket Server older than 5.13 failed to sync since Sourcegraph 3.12. This was due to us querying for the archived label, but Bitbucket Server 5.13 does not support labels. #​8883
• A regression in repo-updater was fixed that lead to every repository's git clone being updated every time the list of repositories was synced from the code host. #​8501

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