Update alextartan/guzzle-psr18-adapter requirement from ^1.2 || ^2.0 to ^1.2 || ^2.0 || ^4.0

Updates the requirements on [alextartan/guzzle-psr18-adapter](https://github.com/alextartan/guzzle-psr18-adapter) to permit the latest version.
- [Release notes](https://github.com/alextartan/guzzle-psr18-adapter/releases)
- [Commits](https://github.com/alextartan/guzzle-psr18-adapter/commits/4.0.4)

---
updated-dependencies:
- dependency-name: alextartan/guzzle-psr18-adapter
  dependency-version: 4.0.4
  dependency-type: direct:development
...

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

Author: dependabot[bot]

composer.json

@@ -29,7 +29,7 @@
     "require-dev": {
         "codeception/codeception": "^4.1",
         "php-vcr/php-vcr": "^1.5",
-        "alextartan/guzzle-psr18-adapter": "^1.2 || ^2.0",
+        "alextartan/guzzle-psr18-adapter": "^1.2 || ^2.0 || ^4.0",
         "laminas/laminas-diactoros": "^2.3 || ^3.0",
         "cache/array-adapter": "^1.0",
         "codeception/module-asserts": "^1.3",