Update nyholm/psr7 requirement from ^1.5 to ^1.7

Updates the requirements on [nyholm/psr7](https://github.com/Nyholm/psr7) to permit the latest version.
- [Release notes](https://github.com/Nyholm/psr7/releases)
- [Changelog](https://github.com/Nyholm/psr7/blob/master/CHANGELOG.md)
- [Commits](Nyholm/psr7@1.5.0...1.7.0)

---
updated-dependencies:
- dependency-name: nyholm/psr7
  dependency-type: direct:development
...

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

composer.json

@@ -43,7 +43,7 @@
     "require-dev": {
         "adriansuter/php-autoload-override": "^1.4",
         "laminas/laminas-diactoros": "^2.17",
-        "nyholm/psr7": "^1.5",
+        "nyholm/psr7": "^1.7",
         "php-http/psr7-integration-tests": "dev-master",
         "phpstan/phpstan": "^1.9",
         "phpunit/phpunit": "^9.5",