chore: update the latest version property in ui-model.yml

In Antora 3, the model is `page.component.latest`. It was previously `page.component.latestVersion`
The hbs templates have been updated but the source preview model still refers to the old property.
So the links to the latest version in preview pages weren't resolved.

preview-src/ui-model.yml

@@ -23,7 +23,7 @@ site:
     - url: '#'
       version: '1.0'
       displayVersion: '1.0'
-    latestVersion: *latest_version_abc
+    latest: *latest_version_abc
   - &component
     name: bonita
     title: Bonita Theme
@@ -34,7 +34,7 @@ site:
       version: '2021.1'
       displayVersion: '2021.1'
     - &component_version
-      url: '#'
+      url: *home_url
       version: 'dev'
       displayVersion: 'dev'
     - url: '#'
@@ -43,7 +43,7 @@ site:
     - url: '#'
       version: '0'
       displayVersion: 'archives'
-    latestVersion: *latest_version_bonita
+    latest: *latest_version_bonita
   - name: 123
     title: Project 123
     url: '#'
@@ -58,7 +58,7 @@ site:
     - url: '#'
       version: '2.0'
       displayVersion: '2.0'
-    latestVersion: *latest_version_123
+    latest: *latest_version_123
 page:
   url: *home_url
   home: true