Update psr/http-message requirement from ^1.0 to ^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](php-fig/http-message@1.0...2.0)

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

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

composer.json

@@ -19,7 +19,7 @@
     "require": {
         "php": "^8.0",
         "nikic/fast-route": "^1.3",
-        "psr/http-message": "^1.0",
+        "psr/http-message": "^2.0",
         "psr/simple-cache": "^2.0|^3.0",
         "yiisoft/http": "^1.2",
         "yiisoft/router": "^2.1|^3.0"