installer: switch to streamlink/FFmpeg-Builds

[bastimeyer]

Resolves #3931

Upgrades the bundled 3rd party FFmpeg build (Zeranoe) in Streamlink's Windows installer from 4.2 to 4.4, built here on GH actions:
https://github.com/streamlink/FFmpeg-Builds

FFmpeg build flags (chosen by the win32 gpl 4.4 build flavor):

  --enable-gpl
  --enable-version3
  --disable-debug
  --disable-w32threads
  --enable-pthreads
  --enable-iconv
  --enable-libxml2
  --enable-zlib
  --enable-libfreetype
  --enable-libfribidi
  --enable-gmp
  --enable-lzma
  --enable-fontconfig
  --enable-libvorbis
  --enable-opencl
  --enable-libvmaf
  --enable-vulkan
  --disable-libxcb
  --disable-xlib
  --enable-amf
  --enable-libaom
  --enable-avisynth
  --enable-libdav1d
  --disable-libdavs2
  --disable-libfdk-aac
  --enable-ffnvcodec
  --enable-cuda-llvm
  --enable-frei0r
  --enable-libglslang
  --enable-libgme
  --enable-libass
  --enable-libbluray
  --enable-libmp3lame
  --enable-libopus
  --enable-libtheora
  --enable-libvpx
  --enable-libwebp
  --enable-lv2
  --enable-libmfx
  --enable-libopencore-amrnb
  --enable-libopencore-amrwb
  --enable-libopenjpeg
  --disable-librav1e
  --enable-librubberband
  --enable-schannel
  --enable-sdl2
  --enable-libsoxr
  --enable-libsrt
  --disable-libsvtav1
  --enable-libtwolame
  --disable-libuavs3d
  --disable-libdrm
  --disable-vaapi
  --enable-libvidstab
  --enable-libx264
  --enable-libx265
  --disable-libxavs2
  --enable-libxvid
  --enable-libzimg
  --enable-libzvbi