ci: with 8.9 images out, move 8.8 chart values to different group (#4609)

Author: bkenez

.github/renovate.json5

@@ -311,6 +311,9 @@
         'charts/camunda-platform-8.7/Chart.yaml',
         'charts/camunda-platform-8.7/values.yaml',
         'charts/camunda-platform-8.7/values-latest.yaml',
+        'charts/camunda-platform-8.8/Chart.yaml',
+        'charts/camunda-platform-8.8/values.yaml',
+        'charts/camunda-platform-8.8/values-latest.yaml',
       ],
       matchUpdateTypes: ['patch', 'pin'],
       schedule: ['at any time'],
@@ -328,9 +331,6 @@
         'regex',
       ],
       matchFileNames: [
-        'charts/camunda-platform-8.8/Chart.yaml',
-        'charts/camunda-platform-8.8/values.yaml',
-        'charts/camunda-platform-8.8/values-latest.yaml',
         'charts/camunda-platform-8.9/Chart.yaml',
         'charts/camunda-platform-8.9/values.yaml',
         'charts/camunda-platform-8.9/values-latest.yaml',