build(deps): bump symfony/polyfill-intl-idn in /tests/php_test_files (#136)

Bumps [symfony/polyfill-intl-idn](https://github.com/symfony/polyfill-intl-idn) from 1.33.0 to 1.38.1.
- [Release notes](https://github.com/symfony/polyfill-intl-idn/releases)
- [Commits](symfony/polyfill-intl-idn@v1.33.0...v1.38.1)

---
updated-dependencies:
- dependency-name: symfony/polyfill-intl-idn
  dependency-version: 1.38.1
  dependency-type: indirect
...

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Author: dependabot[bot]