Sync CAPO maintainers

See:
kubernetes-sigs/cluster-api-provider-openstack#2727

Also cleanup of other emeritus approvers.

Author: mdbooth

config/kubernetes-sigs/sig-cluster-lifecycle/teams.yaml

@@ -257,23 +257,15 @@ teams:
     description: admin access to cluster-api-provider-openstack
     members:
     - EmilienM
-    - jichenjc
     - lentzi90
-    - mdbooth
-    - seanschneeweiss
-    - tobiasgiese
     privacy: closed
     repos:
       cluster-api-provider-openstack: admin
   cluster-api-provider-openstack-maintainers:
     description: write access to cluster-api-provider-openstack
     members:
     - EmilienM
-    - jichenjc
     - lentzi90
-    - mdbooth
-    - seanschneeweiss
-    - tobiasgiese
     privacy: closed
     repos:
       cluster-api-provider-openstack: write