[HttpClient] Fix deps

Author: nicolas-grekas

composer.json

@@ -24,7 +24,8 @@
         "php": "^7.2.5",
         "psr/log": "^1.0",
         "symfony/http-client-contracts": "^1.1.8|^2",
-        "symfony/polyfill-php73": "^1.11"
+        "symfony/polyfill-php73": "^1.11",
+        "symfony/service-contracts": "^1.0|^2"
     },
     "require-dev": {
         "guzzlehttp/promises": "^1.3.1",
@@ -33,9 +34,7 @@
         "psr/http-client": "^1.0",
         "symfony/dependency-injection": "^4.4|^5.0",
         "symfony/http-kernel": "^4.4|^5.0",
-        "symfony/process": "^4.4|^5.0",
-        "symfony/service-contracts": "^1.0|^2",
-        "symfony/var-dumper": "^4.4|^5.0"
+        "symfony/process": "^4.4|^5.0"
     },
     "autoload": {
         "psr-4": { "Symfony\\Component\\HttpClient\\": "" },