bug #4149 Add symfony/deprecation-contracts to dependencies. (Warxcell)

This PR was merged into the 3.0.x-dev branch.

Discussion
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Add symfony/deprecation-contracts to dependencies.

Fixes `Attempted to call function "trigger_deprecation" from namespace "EasyCorp\Bundle\EasyAdminBundle\Router".`

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Commits
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74bbec0 Add symfony/deprecation-contracts to dependencies.

composer.json

@@ -37,7 +37,8 @@
         "symfony/string": "^5.0",
         "symfony/translation": "^4.4|^5.0",
         "symfony/twig-bundle": "^4.4|^5.0",
-        "symfony/uid": "^5.1"
+        "symfony/uid": "^5.1",
+        "symfony/deprecation-contracts": "^2.0"
     },
     "require-dev": {
         "dama/doctrine-test-bundle": "^6.4",