Backport of docker: use minor alpine version into release/1.21.x #22909
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Backport
This PR is auto-generated from #22895 to be assessed for backporting due to the inclusion of the label backport/1.21.
The below text is copied from the body of the original PR.
Description
Alpine auto-patches their vulns over time. Pinning it to a patch version would alert customers security scanners. We should rely on the minor LTS version to receive patches automatically.
Testing & Reproduction steps
Links
PR Checklist
PCI review checklist
I have documented a clear reason for, and description of, the change I am making.
If applicable, I've documented a plan to revert these changes if they require more than reverting the pull request.
If applicable, I've documented the impact of any changes to security controls.
Examples of changes to security controls include using new access control methods, adding or removing logging pipelines, etc.
Overview of commits