Chore(deps-dev): Bump phpunit/phpunit in /tests/integration

Bumps [phpunit/phpunit](https://github.com/sebastianbergmann/phpunit) from 9.6.34 to 13.1.12.
- [Release notes](https://github.com/sebastianbergmann/phpunit/releases)
- [Changelog](https://github.com/sebastianbergmann/phpunit/blob/13.1.12/ChangeLog-13.1.md)
- [Commits](sebastianbergmann/phpunit@9.6.34...13.1.12)

---
updated-dependencies:
- dependency-name: phpunit/phpunit
  dependency-version: 13.1.12
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

tests/integration/composer.json

@@ -1,6 +1,6 @@
 {
     "require-dev": {
-        "phpunit/phpunit": "~9",
+        "phpunit/phpunit": "~13",
         "behat/behat": "~3.31.0",
         "guzzlehttp/guzzle": "7.10.1",
         "jarnaiz/behat-junit-formatter": "^1.3",