chore(deps): update golang:1.27.1-alpine docker digest to 8a5910f

[renovate-sh-app]

This PR contains the following updates:

Package	Type	Update	Change
golang (source)	stage	digest	cf6fca6 → 8a5910f

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[renovate-reviewer]

All checks have passed and this PR has been approved.

• ✅ PR created by Renovate
• ✅ Not flagged for manual review
• ✅ All commits by Renovate
• ✅ All commits are signed
• ✅ Files previously updated by Renovate
• ✅ Update type: digest
• ✅ Diff check: changes only dependency lines
• ✅ Risk scan: low risk. The Dockerfile updates the golang:1.27.1-alpine image digest from sha256:cf6fca6 to sha256:4cb7ac9 across all build stages.
• ✅ Version direction: no downgrades
• ✅ Packages previously updated
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