Bump jms/serializer-bundle from 2.4.3 to 3.1.0

Bumps [jms/serializer-bundle](https://github.com/schmittjoh/JMSSerializerBundle) from 2.4.3 to 3.1.0.
- [Release notes](https://github.com/schmittjoh/JMSSerializerBundle/releases)
- [Changelog](https://github.com/schmittjoh/JMSSerializerBundle/blob/master/CHANGELOG.md)
- [Commits](schmittjoh/JMSSerializerBundle@2.4.3...3.1.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>

composer.json

@@ -32,7 +32,7 @@
 		"friendsofsymfony/rest-bundle": "^2.3",
 		"hwi/oauth-bundle": "^0.6",
 		"incenteev/composer-parameter-handler": "^2.1",
-		"jms/serializer-bundle": "^2.4",
+		"jms/serializer-bundle": "^3.1",
 		"knplabs/github-api": "^2.8",
 		"liip/imagine-bundle": "~1.9",
 		"oneup/uploader-bundle": "^2.0",