[bext-sml2] build failure: port references non-existent v2.0.0 tag (404 from GitHub)

[RampantDespair]

Bug

The bext-sml2 port fails to build because it attempts to download a non-existent GitHub tag:

https://github.com/qlibs/sml/archive/v2.0.0.tar.gz

This URL returns 404, causing the port to fail during vcpkg_from_github.

The upstream repository (qlibs/sml) does not publish version tags or releases, so v2.0.0 does not exist.

To Reproduce

vcpkg install bext-sml2:x64-windows

Failure output (excerpt)

Downloading https://github.com/qlibs/sml/archive/v2.0.0.tar.gz
error: failed: status code 404
CMake Error at vcpkg_download_distfile.cmake:136 (message):
  Download failed, halting portfile.