ci: bump dawidd6/action-send-mail

Bumps [dawidd6/action-send-mail](https://github.com/dawidd6/action-send-mail) from 6e502825a508b867ab2954ad6343b68787624c01 to c50dc4cc848ade21f848990889906d804fae78c5.
- [Release notes](https://github.com/dawidd6/action-send-mail/releases)
- [Commits](dawidd6/action-send-mail@6e50282...c50dc4c)

---
updated-dependencies:
- dependency-name: dawidd6/action-send-mail
  dependency-version: c50dc4cc848ade21f848990889906d804fae78c5
  dependency-type: direct:production
...

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

Author: dependabot[bot]

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

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Send push notification email
-        uses: dawidd6/action-send-mail@6e502825a508b867ab2954ad6343b68787624c01 # pinned
+        uses: dawidd6/action-send-mail@c50dc4cc848ade21f848990889906d804fae78c5 # pinned
         with:
           server_address: ${{ secrets.SMTP_HOST }}
           server_port: ${{ secrets.SMTP_PORT }}