build(deps): bump dawidd6/action-send-mail from 12 to 13

Bumps [dawidd6/action-send-mail](https://github.com/dawidd6/action-send-mail) from 12 to 13.
- [Release notes](https://github.com/dawidd6/action-send-mail/releases)
- [Commits](dawidd6/action-send-mail@949ec3d...e9d4422)

---
updated-dependencies:
- dependency-name: dawidd6/action-send-mail
  dependency-version: '13'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/cove-ocds-live-tests.yml

@@ -25,7 +25,7 @@ jobs:
           DJANGO_SETTINGS_MODULE: cove_project.settings
         run: pytest tests/test_functional.py
       - if: failure()
-        uses: dawidd6/action-send-mail@949ec3d78a574a9519068669594c74bcb1b05d7b # v12
+        uses: dawidd6/action-send-mail@e9d44227e5ff9b5be74ac40a69c554324ded2e5b # v13
         with:
           server_address: ${{ secrets.MAIL_HOST }}
           server_port: ${{ secrets.MAIL_PORT }}