chore(deps): update alpine:3.21 docker digest to 48b0309

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
alpine	final	digest	c3f8e73 → 48b0309

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🔧 Changed

• Updated the healthcheck-build stage base image digest for alpine:3.21 in Dockerfile from c3f8e73 to 48b0309 (sha256:48b0309ca019d89d40f670aa1bc06e426dc0931948452e8491e3d65087abc07d).

• Automerge is disabled; merge manually when ready.

• Verify the updated base digest doesn’t change the expected healthcheck/build behavior.

• Confirm there are no other alpine:3.21@sha256:* digests elsewhere in the Dockerfile that should be aligned.

• Rebuild/retest the healthcheck stage to ensure the Alpine+package versions used during compilation still succeed.

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📝 Walkthrough

Walkthrough

The Dockerfile's healthcheck-build stage now pins a different sha256 digest for the alpine:3.21 base image. The stage name and remaining build and release-stage instructions are unchanged.

🚥 Pre-merge checks | ✅ 2

✅ Passed checks (2 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch renovate/alpine-3.21

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