Bump symfony/http-client in the composer group across 1 directory

Bumps the composer group with 1 update in the / directory: [symfony/http-client](https://github.com/symfony/http-client).


Updates `symfony/http-client` from 6.4.14 to 6.4.15
- [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@v6.4.14...v6.4.15)

---
updated-dependencies:
- dependency-name: symfony/http-client
  dependency-type: direct:production
  dependency-group: composer
...

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