[sdl2pp] fix dependency error

[jimwang118]

Fixes #30026

CMake Error at CMakeLists.txt:33 (target_link_libraries):
  Target "tsdl2" links to:

    SDL2_mixer::SDL2_mixer

  but the target was not found.  Possible reasons include:

    * There is a typo in the target name.
    * A find_package call is missing for an IMPORTED target.
    * An ALIAS target is missing.

Add dependencies when linking sdl2pp in the protfile.cmake file.

• Changes comply with the maintainer guide
• SHA512s are updated for each updated download
• The "supports" clause reflects platforms that may be fixed by this new version
• Any fixed CI baseline entries are removed from that file.
• Any patches that are no longer applied are deleted from the port's directory.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Only one version is added to each modified port's versions file.