[HttpClient] Fix deps=low

Author: nicolas-grekas

composer.json

@@ -33,7 +33,7 @@
         "php-http/httplug": "^1.0|^2.0",
         "psr/http-client": "^1.0",
         "symfony/dependency-injection": "^4.3|^5.0",
-        "symfony/http-kernel": "^4.4",
+        "symfony/http-kernel": "^4.4.13",
         "symfony/process": "^4.2|^5.0"
     },
     "autoload": {