Log Message:
rubberband: update to 1.9.1

Changes in Rubber Band v1.9.1

 * Switch build system from Makefiles and Visual Studio project to
   Meson/Ninja for all platforms. There are still Makefiles and VS
   projects included in otherbuilds/ for those who wish to use them to
   build the static library directly
 * Make various fixes to improve sound quality when pitch-shifting
   dynamically in real-time (requires libsamplerate)
 * Fix floating-point exception when a very very long stretch factor
   is presented
 * Move the two directories that together provide the .NET interface
   (rubberband-sharp and rubberband-dll) into their own subdir (dotnet)
 * Ensure the library builds and runs correctly on ARM Mac (Apple
   Silicon, M1), and also on Windows using the Visual C++ Clang
   front-end

The API is unchanged and the library is binary compatible with
version 1.7.