fix(ci): pin action-send-mail by SHA and correct its lockfile entry

[hyperpolymath]

gh actions-lock --verify reported an unreachable pin:

✗ Unreachable pin dawidd6/action-send-mail@v3.12.0
  pinned 67ce3558d613 is not an ancestor of 2cea9617b09d

The workflow referenced the mutable tag @v3.12.0 and the manifest recorded a commit (67ce3558…) that is not the tag's target. This pins the action by SHA (the actual v3.12.0 commit, 2cea9617b09d…) and corrects the manifest entry to match. Verify is clean locally (rc=0).

[coderabbitai]

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⚙️ Run configuration

Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between cf56015 and 020cd70.

⛔ Files ignored due to path filters (1)

• .github/workflows/actions.lock is excluded by !**/*.lock

📒 Files selected for processing (1)

• .github/workflows/push-email-notify.yml

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< This PR is a classic: 'small change' with 'large consequences'. >
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