build(deps): bump dawidd6/action-send-mail from 3 to 4

Bumps [dawidd6/action-send-mail](https://github.com/dawidd6/action-send-mail) from 3 to 4.
- [Release notes](https://github.com/dawidd6/action-send-mail/releases)
- [Commits](dawidd6/action-send-mail@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/ping-developer.yml

@@ -62,7 +62,7 @@ jobs:
             # #
 
             - name: Send mail
-              uses: dawidd6/action-send-mail@v3
+              uses: dawidd6/action-send-mail@v4
               with:
                     server_address: ${{secrets.EMAIL_SMTP}}
                     server_port: 465