Resolve terraform-provider-openstack deprecation notices

[chess-knight]

╷
│ Warning: Argument is deprecated
│ 
│   with provider["registry.opentofu.org/terraform-provider-openstack/openstack"],
│   on main.tf line 2, in provider "openstack":
│    2: provider "openstack" {
│ 
│ Users not using loadbalancer resources can ignore this message. Support for neutron-lbaas will be removed on next major release. Octavia will be the only supported method for loadbalancer resources. Users using octavia will
│ have to remove 'use_octavia' option from the provider configuration block. Users using neutron-lbaas will have to migrate/upgrade to octavia.
│ 
│ (and 2 more similar warnings elsewhere)
╵
╷
│ Warning: Deprecated Resource
│ 
│   with openstack_compute_secgroup_v2.security_group_ssh,
│   on neutron.tf line 3, in resource "openstack_compute_secgroup_v2" "security_group_ssh":
│    3: resource "openstack_compute_secgroup_v2" "security_group_ssh" {
│ 
│ use openstack_networking_secgroup_v2 resource instead
│ 
│ (and 8 more similar warnings elsewhere)
╵

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