chore(deps): update container image tccr.io/truecharts/kanboard to v1.2.28 (#8460)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[tccr.io/truecharts/kanboard](https://togithub.com/truecharts/containers)
| patch | `1.2.26` -> `1.2.28` |

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charts/stable/kanboard/Chart.yaml

@@ -1,8 +1,8 @@
 apiVersion: v2
-appVersion: "1.2.26"
+appVersion: "1.2.28"
 description: Kanboard is a free and open source Kanban project management software.
 name: kanboard
-version: 12.0.7
+version: 12.0.8
 kubeVersion: ">=1.16.0-0"
 keywords:
   - kanboard

charts/stable/kanboard/values.yaml

@@ -1,6 +1,6 @@
 image:
   repository: tccr.io/truecharts/kanboard
-  tag: 1.2.26@sha256:d266d93b0e1047db83e3a324d9757eaa0b00efeee920fa12b82fbe0482344275
+  tag: 1.2.28@sha256:ea342db8dfd165ea31b76efa4980bea9a548c7eb22c842d877cf633f30f37f68
   pullPolicy: IfNotPresent
 service:
   main: