v2.9.1

Windows-only fix release with no changes to qdl itself: the v2.9 Windows
binaries report v2.9-dirty in qdl --version although they are clean builds
of the tag. The Linux and macOS binaries are unchanged from v2.9.

What's Changed

• github: set autocrlf before meson setup on Windows by @igoropaniuk in #350,
  backported in #356

Full Changelog: v2.9...v2.9.1