Update samba to version v4.20.5

[nmfretz]

🤖 This is an automated pull request to update samba to version v4.20.5-r0. This PR must be reviewed and tested before merging.

[nmfretz]

🤖 This is an automated summary of installation tests for samba:

• ✅ App successfully installed in umbrel-dev instance
• ✅ App successfully listed in umbrel.yaml
• ✅ App UI successfully returns a 200 status code
• 📸 Screenshot of the app:
  

This PR must still be reviewed and tested before merging.

[nmfretz]

@joaovictor-local just a friendly ping before I merge this. Would you be interested and able to update your UI container based on @sharknoon's suggestion here:
#1161 (comment)

[github-actions]

🎉   Linting finished with no errors or warnings   🎉

Thank you for your submission! This is an automated linter that checks for common issues in pull requests to the Umbrel App Store.

Please review the linting results below and make any necessary changes to your submission.

Linting Results

Severity	File	Description
ℹ️	samba/docker-compose.yml	External port mapping "446:445": Port mappings may be unnecessary for the app to function correctly. Docker's internal DNS resolves container names to IP addresses within the same network. External access to the web interface is handled by the app_proxy container. Port mappings are only needed if external access is required to a port not proxied by the app_proxy, or if an app needs to expose multiple ports for its functionality (e.g., DHCP, DNS, P2P, etc.).

Legend

Symbol	Description
❌	Error: This must be resolved before this PR can be merged.
⚠️	Warning: This is highly encouraged to be resolved, but is not strictly mandatory.
ℹ️	Info: This is just for your information.

[nmfretz]

Reviewed and tested. No response on updating the UI instructions, so merging as-is.