chore(deps): update container images

.drone.yml

@@ -26,7 +26,7 @@ steps:
 - name: markdown lint
   commands:
   - markdownlint *.md
-  image: git.cryptic.systems/volker.raschek/markdownlint:0.49.0
+  image: git.cryptic.systems/volker.raschek/markdownlint:0.48.0
   resources:
     limits:
       cpu: 150

renovate.json

@@ -4,7 +4,6 @@
     "local>volker.raschek/renovate-config:default#master",
     "local>volker.raschek/renovate-config:container#master",
     "local>volker.raschek/renovate-config:actions#master",
-    "local>volker.raschek/renovate-config:helm#master",
     "local>volker.raschek/renovate-config:npm#master",
     "local>volker.raschek/renovate-config:regexp#master"
   ],