Description of problem:
DS allows to set a higher value of nsslapd-numlisteners than its limit of 4:

1. dsconf localhost config get nsslapd-numlisteners
   nsslapd-numlisteners: 1
2. dsconf localhost config replace nsslapd-numlisteners=5
   Successfully replaced "nsslapd-numlisteners"
3. dsconf localhost config get nsslapd-numlisteners
   nsslapd-numlisteners: 4
4. grep nsslapd-numlisteners /etc/dirsrv/slapd-localhost/dse.ldif
   nsslapd-numlisteners: 5

1. systemctl restart dirsrv@localhost
2. dsconf localhost config get nsslapd-numlisteners
   nsslapd-numlisteners: 4
3. grep nsslapd-numlisteners /etc/dirsrv/slapd-localhost/dse.ldif
   nsslapd-numlisteners: 5

Version-Release number of selected component (if applicable):
389-ds-base-2.3.4-3.el9.x86_64

How reproducible:
always