Update http-interop/http-factory-tests requirement from ^0.7.0 to ^0.8.0

Updates the requirements on [http-interop/http-factory-tests](https://github.com/http-interop/http-factory-tests) to permit the latest version.
- [Release notes](https://github.com/http-interop/http-factory-tests/releases)
- [Commits](http-interop/http-factory-tests@0.7.0...0.8.0)

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

composer.json

@@ -38,7 +38,7 @@
   "require-dev": {
     "ext-json": "*",
     "adriansuter/php-autoload-override": "^1.2",
-    "http-interop/http-factory-tests": "^0.7.0",
+    "http-interop/http-factory-tests": "^0.8.0",
     "php-http/psr7-integration-tests": "dev-master",
     "phpstan/phpstan": "^0.12",
     "phpunit/phpunit": "^8.5 || ^9.3",