feat(deps): update alpine docker tag to v3.21

| datasource | package | from | to   |
| ---------- | ------- | ---- | ---- |
| docker     | alpine  | 3.17 | 3.21 |

Author: graphops-renovate[bot]

charts/common/_unittests/layout-tests/single-component/README.md

@@ -0,0 +1,20 @@
+# single-component-test
+
+![Version: 0.1.0](https://img.shields.io/badge/Version-0.1.0-informational?style=flat-square)
+
+## Requirements
+
+| Repository | Name | Version |
+|------------|------|---------|
+| file://../../../ | common | >=0.0.0-0 |
+
+## Values
+
+| Key | Description | Type | Default |
+|-----|-------------|------|---------|
+ | myComponent.__enabled |  | bool | `true` |
+ | myComponent.workload.__enabled |  | bool | `true` |
+ | myComponent.workload.spec.image |  | string | `"alpine:3.21"` |
+ | myComponent.workload.spec.replicas |  | int | `2` |
+ | myComponentDefaults |  | object | `{}` |
+

charts/common/_unittests/layout-tests/single-component/values.yaml

@@ -3,7 +3,7 @@ myComponent:
   workload:
     __enabled: true
     spec:
-      image: "alpine:3.17"
+      image: "alpine:3.21"
       replicas: 2
 
 myComponentDefaults: {}