Merge pull request #3080 from slimphp/dependabot/composer/guzzlehttp/psr7-tw-1.8

Update guzzlehttp/psr7 requirement from ^1.7 to ^1.8

Author: l0gicgate

composer.json

@@ -56,7 +56,7 @@
     "require-dev": {
         "ext-simplexml": "*",
         "adriansuter/php-autoload-override": "^1.2",
-        "guzzlehttp/psr7": "^1.7",
+        "guzzlehttp/psr7": "^1.8",
         "http-interop/http-factory-guzzle": "^1.0",
         "laminas/laminas-diactoros": "^2.4",
         "nyholm/psr7": "^1.4",