Bump dawidd6/action-send-mail from 3.6.1 to 3.7.0

Bumps [dawidd6/action-send-mail](https://github.com/dawidd6/action-send-mail) from 3.6.1 to 3.7.0.
- [Release notes](https://github.com/dawidd6/action-send-mail/releases)
- [Commits](https://github.com/dawidd6/action-send-mail/compare/v3.6.1...v3.7.0)

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

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

.github/workflows/generate-docs.yml

@@ -115,7 +115,7 @@ jobs:
         # Only send notifications for scheduled runs. Runs from pull requests
         # show failures in the Github UI.
         if: failure() && github.event_name == 'schedule'
-        uses: dawidd6/action-send-mail@v3.6.1
+        uses: dawidd6/action-send-mail@v3.7.0
         with:
           server_address: ${{secrets.SMTP_HOST}}
           server_port: ${{secrets.SMTP_PORT}}