chore(deps): update grafana/shared-workflows digest to 2f1ddaf

[renovate-sh-app]

This PR contains the following updates:

Package	Type	Update	Change
grafana/shared-workflows (changelog)	workflow	digest	86e65f7 → 2f1ddaf

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[renovate-reviewer]

Update type digest is eligible for auto-approval but has failed the following checks:

• ❌ Diff check: Updates the pinned SHA of the grafana/shared-workflows reusable docker-build-push-multiarch workflow in .github/workflows/build.yml from 86e65f7 to 2f1ddaf.
• ❌ Risk scan: medium risk. Updates the pinned SHA of the grafana/shared-workflows reusable docker-build-push-multiarch workflow in .github/workflows/build.yml from 86e65f7 to 2f1ddaf.

Passed checks

• ✅ 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
• ✅ Version direction: no downgrades
• ✅ Packages previously updated
• ✅ TruffleHog Secret Scanning passed
• ✅ zizmor GitHub Actions static analysis passed

This PR will not be automatically approved. Please review manually.

Reviewer notes: Confirm the new SHA is a legitimate commit in grafana/shared-workflows; note the ref tracks the moving 'main' branch, so verify the referenced reusable workflow's contents.