Bump mailchecker from 6.0.11 to 6.0.15

Bumps [mailchecker](https://github.com/FGRibreau/mailchecker) from 6.0.11 to 6.0.15.
- [Changelog](https://github.com/FGRibreau/mailchecker/blob/master/CHANGELOG.md)
- [Commits](FGRibreau/mailchecker@v6.0.11...v6.0.15)

---
updated-dependencies:
- dependency-name: mailchecker
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements.txt

@@ -1,7 +1,7 @@
 beautifulsoup4 == 4.12.3
 boto3 == 1.35.90
 ftfy == 6.3.1
-mailchecker == 6.0.14
+mailchecker == 6.0.15
 openpyxl == 3.1.5
 phonenumbers == 8.13.52
 python-dateutil == 2.9.0.post0