chore(deps): update outlinewiki/outline docker tag to v0.87.4

Author: renovate[bot]

helm/outline/values.yaml

@@ -6,7 +6,7 @@ image:
   # This sets the pull policy for images.
   pullPolicy: IfNotPresent
   # Overrides the image tag whose default is the chart appVersion.
-  tag: "0.85.1"
+  tag: "0.87.4"
 
 # This is for the secrets for pulling an image from a private repository more information can be found here: https://kubernetes.io/docs/tasks/configure-pod-container/pull-image-private-registry/
 imagePullSecrets: []