Bump giggsey/libphonenumber-for-php from 8.12.38 to 8.13.15

Bumps [giggsey/libphonenumber-for-php](https://github.com/giggsey/libphonenumber-for-php) from 8.12.38 to 8.13.15.
- [Release notes](https://github.com/giggsey/libphonenumber-for-php/releases)
- [Commits](giggsey/libphonenumber-for-php@8.12.38...8.13.15)

---
updated-dependencies:
- dependency-name: giggsey/libphonenumber-for-php
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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