Unfortunately the upgrade to v2.4.3 broke the ldap connection.

I have configured an ldap connection like this:

```
ldap_uris = ldaps://xxx.com
ldap_auth_dn = uid=xxx,ou=general accounts,dc=xxx,dc=com
ldap_auth_dn_password = xxx
ldap_base = dc=xxx,dc=com

passdb ldap {
    ldap_bind = yes
    [...]
}
```

v2.4.3 cannot connect and says:

```
auth: Error: ldap(ldaps://xxx.com636): Can't connect to server: ldaps://xxx.com
```

Ldap server logs:

```
ACCEPT from IP=[XXX]:45674 (IP=[::]:636)
TLS established tls_ssf=256 ssf=256 tls_proto=TLS1.3 tls_cipher=AES-256-GCM
closed (connection lost)
```

Downgrade to dovecot v2.4.2 makes it work again.

Was there any ldap change in v2.4.3 that required a config change?

Using ubuntu 24.04 with the dovecot ppa, now forced version 2.4.2 by using 
https://repo.dovecot.org/ce-2.4.2/ubuntu/noble
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