Replace the old osixia/openldap image

The bitnami images are definitely more well-known and up-to-date.

Signed-off-by: Emanuele Aina <emanuele.aina@collabora.com>

docker-compose.yaml

@@ -63,14 +63,13 @@ services:
       DEX_STATIC_CLIENT_SECRET: &dex_secret s3kr3t
 
   ldap:
-    image: osixia/openldap:1.5.0
+    image: bitnami/openldap:2.6.3
     ports:
       - '389:389'
-    command: ["--copy-service"]
     volumes:
       - type: bind
         source: ./config-ldap.ldif
-        target: /container/service/slapd/assets/config/bootstrap/ldif/custom/config-ldap.ldif
+        target: /ldifs/config-ldap.ldif
 
   mediator:
     image: "${AUTHZ_MEDIATOR_IMAGE:-authz-mediator}"