Update httpsoft/http-message requirement from ^1.0 to ^1.1

Updates the requirements on [httpsoft/http-message](https://github.com/httpsoft/http-message) to permit the latest version.
- [Release notes](https://github.com/httpsoft/http-message/releases)
- [Changelog](https://github.com/httpsoft/http-message/blob/master/CHANGELOG.md)
- [Commits](httpsoft/http-message@1.0.0...1.1.1)

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

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

composer.json

@@ -57,7 +57,7 @@
         "ext-simplexml": "*",
         "adriansuter/php-autoload-override": "^1.4",
         "guzzlehttp/psr7": "^2.5",
-        "httpsoft/http-message": "^1.0",
+        "httpsoft/http-message": "^1.1",
         "httpsoft/http-server-request": "^1.1",
         "laminas/laminas-diactoros": "^2.17",
         "nyholm/psr7": "^1.8",