fix(deps): update dependency api-platform/core to v3

This MR contains the following updates:

Package	Type	Update	Change
api-platform/core (source)	require	major	^2.6 -> ^3.0

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Release Notes

api-platform/core

v3.0.0

Compare Source

• Metadata: CRUD on subresource with experimental write support (#​4932)
• Symfony: 6.1 compatibility and remove 4.4 and 5.4 support (#​4851)
• Symfony: removed the $exceptionOnNoToken parameter in ResourceAccessChecker::__construct() (#​4905)
• Symfony: use conventional service names for Doctrine state providers and processors (#​4859)
• Symfony: adjust mapping paths to the SF best practices for Bundles BC Resources/config/api_resources to config/api_resources (#​4853)
• Symfony: src/ApiResource/ is the recommended place for API models (#​4874)
• Cache: remove guzzle from the Varnish purger (#​4872)

Various cleanup in services and removal of backward compatibility layer.

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composer.json

@@ -6,7 +6,7 @@
     "require": {
         "php": ">=7.3",
         "ext-json": "*",
-        "api-platform/core": "^2.6",
+        "api-platform/core": "^3.0",
         "dbp/relay-core-bundle": "^0.1.34",
         "symfony/framework-bundle": "^5.4"
     },