ci(renovate): disable minor updates on digest files (#4611)

Author: bkenez

.github/renovate.json5

@@ -147,6 +147,7 @@
       matchFileNames: [
         'charts/camunda-platform-8.*/values.yaml',
         'charts/camunda-platform-8.*/values-latest.yaml',
+        'charts/camunda-platform-8.*/values-digest.yaml',
       ],
       matchUpdateTypes: ['minor'],
     },