Update Samba to 4.21.9+ to fix CVE-2025-10230

[bas-tard]

The current image uses Samba 4.21.4 which is vulnerable to CVE-2025-10230.

Fixed versions are available: 4.21.9, 4.22.5, 4.23.2

Reference: https://www.samba.org/samba/security/CVE-2025-10230.html

Cheers!

[bas-tard]

Created PR #144

[Unicorn9x]

@crazy-max could you take a look for security reason?