Migrate integration tests away from `bitnamilegacy/openldap`

[Hipska]

Bitnami was taken over by Broadcom/VMWare/Tanzu and decided to only provide paid, security hardened images. Therefore the existing images have been moved to a legacy repository where they will not receive updates anymore.

• How to prepare for the Bitnami Changes coming soon
• https://github.com/bitnami/containers/issues/83267

It is best to migrate to another image repository for the integration tests: https://github.com/influxdata/telegraf/blob/4054043bf6005ca5dfef76e8a10df9385eee7e3a/plugins/inputs/ldap/ldap_test.go#L97 https://github.com/influxdata/telegraf/blob/4054043bf6005ca5dfef76e8a10df9385eee7e3a/plugins/inputs/openldap/openldap_test.go#L65