Bump the php-dependencies group with 2 updates

Bumps the php-dependencies group with 2 updates: [symfony/http-client](https://github.com/symfony/http-client) and [symfony/mailgun-mailer](https://github.com/symfony/mailgun-mailer).


Updates `symfony/http-client` from 7.1.5 to 7.1.6
- [Release notes](https://github.com/symfony/http-client/releases)
- [Changelog](https://github.com/symfony/http-client/blob/7.1/CHANGELOG.md)
- [Commits](symfony/http-client@v7.1.5...v7.1.6)

Updates `symfony/mailgun-mailer` from 7.1.3 to 7.1.6
- [Release notes](https://github.com/symfony/mailgun-mailer/releases)
- [Changelog](https://github.com/symfony/mailgun-mailer/blob/7.1/CHANGELOG.md)
- [Commits](symfony/mailgun-mailer@v7.1.3...v7.1.6)

---
updated-dependencies:
- dependency-name: symfony/http-client
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: php-dependencies
- dependency-name: symfony/mailgun-mailer
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: php-dependencies
...

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