Allow symfony/contracts v3 (#1043)

Author: nicolas-grekas

composer.json

@@ -17,10 +17,10 @@
         "ext-json": "*",
         "psr/cache": "^1.0 || ^2.0 || ^3.0",
         "psr/log": "^1.0",
-        "symfony/deprecation-contracts": "^2.1",
+        "symfony/deprecation-contracts": "^2.1 || ^3.0",
         "symfony/http-client": "^4.4.16 || ^5.1.7,!=5.2.0 || ^6.0",
-        "symfony/http-client-contracts": "^1.1.8 || ^2.0",
-        "symfony/service-contracts": "^1.0 || ^2.0"
+        "symfony/http-client-contracts": "^1.1.8 || ^2.0 || ^3.0",
+        "symfony/service-contracts": "^1.0 || ^2.0 || ^3.0"
     },
     "conflict": {
         "async-aws/s3": "<1.1"