Update quay.io/linuxserver.io/code-server Docker tag to v4.9.1 (#31)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [quay.io/linuxserver.io/code-server](https://github.com/linuxserver/docker-code-server) | final | minor | `4.8.3` -> `4.9.1` |

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Reviewed-on: #31
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Dockerfile

@@ -1,4 +1,4 @@
-FROM quay.io/linuxserver.io/code-server:4.8.3
+FROM quay.io/linuxserver.io/code-server:4.9.1
 
 #LABEL build_version=""
 LABEL maintainer="OCram85"