Bump php-amqplib/php-amqplib from 2.12.3 to 3.4.0

Bumps [php-amqplib/php-amqplib](https://github.com/php-amqplib/php-amqplib) from 2.12.3 to 3.4.0.
- [Release notes](https://github.com/php-amqplib/php-amqplib/releases)
- [Changelog](https://github.com/php-amqplib/php-amqplib/blob/master/CHANGELOG.md)
- [Commits](https://github.com/php-amqplib/php-amqplib/compare/v2.12.3...v3.4.0)

---
updated-dependencies:
- dependency-name: php-amqplib/php-amqplib
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

composer.json

@@ -89,7 +89,7 @@
         "nelmio/cors-bundle": "~2.2",
         "ocramius/proxy-manager": "^2.1.1",
         "pagerfanta/pagerfanta": "^2.4",
-        "php-amqplib/php-amqplib": "^2.12",
+        "php-amqplib/php-amqplib": "^3.4",
         "php-amqplib/rabbitmq-bundle": "^2.11",
         "php-http/client-common": "^2.4",
         "php-http/discovery": "^1.14",