chore(deps): update alpine docker tag

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
alpine	final	minor	3.20.3 -> 3.21.0
alpine	stage	minor	3.20.3 -> 3.21.0
alpine	final	minor	3.12 -> 3.21

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This pull-request has been approved by: wuhuizuo

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[LGTM Timeline notifier]

Timeline:

• 2024-12-26 05:33:43.174664534 +0000 UTC m=+1712613.263467077: ☑️ agreed by wuhuizuo.

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