Update psr/http-message requirement from ^1.0 to ^1.0 || ^2.0

Updates the requirements on [psr/http-message](https://github.com/php-fig/http-message) to permit the latest version.
- [Release notes](https://github.com/php-fig/http-message/releases)
- [Changelog](https://github.com/php-fig/http-message/blob/master/CHANGELOG.md)
- [Commits](https://github.com/php-fig/http-message/compare/1.0...2.0)

---
updated-dependencies:
- dependency-name: psr/http-message
  dependency-type: direct:development
...

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

composer.json

@@ -31,7 +31,7 @@
         "phpstan/phpstan-deprecation-rules": "^1.1",
         "phpstan/phpstan-phpunit": "^1.3",
         "phpunit/phpunit": "^10.5",
-        "psr/http-message": "^1.0",
+        "psr/http-message": "^1.0 || ^2.0",
         "respect/coding-standard": "^4.0",
         "sokil/php-isocodes": "^4.2",
         "sokil/php-isocodes-db-only": "^4.0",