chore(deps): update container image docker.io/codercom/code-server to v4.21.1@c9f78fb by renovate (#18177)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| docker.io/codercom/code-server | minor | `4.20.1` -> `4.21.1` |

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This PR has been generated by [Renovate
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charts/stable/code-server/values.yaml

@@ -1,7 +1,7 @@
 image:
   repository: docker.io/codercom/code-server
   pullPolicy: IfNotPresent
-  tag: 4.20.1@sha256:94e705de31ca2e6d0c28fec83f004c4159c037338c485ca0b60bba7e90bde8f9
+  tag: 4.21.1@sha256:c9f78fb7e8ac5fdd3bea856142dd5c5dda0f5183131254516af74135dc97c773
 securityContext:
   container:
     readOnlyRootFilesystem: false