refactor: rubocop fixes

Gemfile

@@ -2,4 +2,4 @@
 
 source 'https://rubygems.org'
 
-gemspec
+gemspec

app/models/concerns/host_ext/proxmox/interfaces.rb

@@ -22,12 +22,12 @@ module Proxmox
     module Interfaces
       extend ActiveSupport::Concern
       def update(attributes = {})
-        add_interfaces_to_compute_attributes(attributes) if self.provider == 'Proxmox' && attributes != nil && attributes.has_key?('compute_attributes')
+        add_interfaces_to_compute_attributes(attributes) if provider == 'Proxmox' && !attributes.nil? && attributes.key?('compute_attributes')
         super(attributes)
       end
 
       def add_interfaces_to_compute_attributes(attributes)
-        attributes['compute_attributes'].store('interfaces_attributes',{})
+        attributes['compute_attributes'].store('interfaces_attributes', {})
         attributes['interfaces_attributes'].each do |index, interface_attributes|
           add_interface_to_compute_attributes(index, interface_attributes, attributes['compute_attributes']['interfaces_attributes'])
         end

app/models/foreman_fog_proxmox/proxmox_vm_queries.rb

@@ -63,7 +63,7 @@ def find_vm_by_uuid(uuid)
     end
 
     def find_vm_in_servers_by_uuid(servers, uuid)
-      servers.get(uuid) if uuid != nil && !uuid.to_s.empty?
+      servers.get(uuid) if !uuid.nil? && !uuid.to_s.empty?
     rescue Fog::Errors::NotFound
       nil
     rescue StandardError => e