minor #44209 Allow v3 contracts where possible (derrabus)

This PR was merged into the 5.4 branch.

Discussion
----------

Allow v3 contracts where possible

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | N/A
| License       | MIT
| Doc PR        | N/A

Commits
-------

e171a3e51e Allow v3 contracts where possible

Author: nicolas-grekas

composer.json

@@ -17,7 +17,7 @@
     ],
     "require": {
         "php": ">=7.2.5",
-        "symfony/deprecation-contracts": "^2.1",
+        "symfony/deprecation-contracts": "^2.1|^3",
         "symfony/polyfill-mbstring": "~1.1",
         "symfony/polyfill-php80": "^1.16"
     },