Add support for doctrine/event-manager:^2

- Symfony version: 6.2
- Algolia Search Bundle version: 6.0.1

### Description

I can't install `algolia/search-bundle` on an existing Symfony 6.2 application due to version conflicts. `algolia/search-bundle` requires `"doctrine/event-manager": "^1.1",` but other standard Doctrine packages require doctrine/event-manager `^2.0`

If I `composer require algolia/search-bundle` using the `--with-all-dependencies` flag, it installs successfully. The tree of dependencies for `doctrine/event-manager` is then:

```sh
$ ❯ composer depends doctrine/event-manager
algolia/search-bundle 6.0.1 requires doctrine/event-manager (^1.1)
doctrine/dbal 3.6.2 requires doctrine/event-manager (^1|^2)
doctrine/migrations 3.6.0 requires doctrine/event-manager (^1.2 || ^2.0)
doctrine/orm 2.14.3 requires doctrine/event-manager (^1.2 || ^2)
doctrine/persistence 3.1.4 requires doctrine/event-manager (^1 || ^2)
```

Start by locating the bundle's Composer dependency declaration for doctrine/event-manager and review the compatibility constraints shown in the issue. Verify the change by running Composer dependency resolution in a Symfony 6.2 application alongside the listed Doctrine packages, and confirm that the bundle installs without requiring --with-all-dependencies.

Written by the indexing model from the issue text.