Defguard పాత వెర్షన్లు డౌన్‌లోడ్

This is a patch for the major 1.6 release.
It contains a various UI and platform-specific bug fixes:
- fix issues with deep-links not working on Windows (#827)
- fix blocking Windows syscalls locking the UI process (#825)
- handle disabled IPv6 stack on Windows causing connection errors (DefGuard/wireguard-rs#131, #930)
Other Changes
- Preserve old package versions on APT repository by @jakub-tldr in #821
- Clear TOTP code input on MFA failure by @jakub-tldr in #857
- Handle error on session end & regenerate QR on session end by @jakub-tldr in #863
- fix(nix): handle various DNS setups in nix package by @wojcik91 in #867
- Chocolatey update workflow by @jakub-tldr in #873
- migrate nix package build process to crane by @wojcik91 in #876
Full Changelog: v1.6.8...v1.6.9