Update CodiMD server version

[craddm]

✅ Checklist

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⤴️ Summary

Updates the Docker image for CodiMD and its associated Postgres database to more recent versions. (2.5.3 and 16-alpine respectively)

🌂 Related issues

Relates to #1738

🔬 Tests

Deployed a working CodiMD web app in an existing SRE.