fix(renovate): Temporarily disable cache until investigation

Currently the cahce is not functional and causes lookup errors, this
patch should disable it and resolve the problem for now.

apps/base/renovate/release.yaml

@@ -43,8 +43,6 @@ data:
   values.yaml: |
     serviceAccount:
       create: true
-    env:
-      RENOVATE_CACHE_DIR: "/cache"
     extraVolumes:
       - name: cache
         persistentVolumeClaim: