Bump adyen/php-api-library from 15.3.0 to 15.4.0

Bumps [adyen/php-api-library](https://github.com/Adyen/adyen-php-api-library) from 15.3.0 to 15.4.0.
- [Release notes](https://github.com/Adyen/adyen-php-api-library/releases)
- [Commits](Adyen/adyen-php-api-library@v15.3.0...v15.4.0)

---
updated-dependencies:
- dependency-name: adyen/php-api-library
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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