Update mono-mdk-preview 4.8.0.371 (#2964)
Update mono-mdk-preview 4.8.0.371 (#2964)

Update mono-mdk-preview to latest Alpha Mono release: 4.8 Alpha 2 (4.8.0.371)
danielbayley/homebrew-versions,wickedsp1d3r/homebrew-versions,404NetworkError/homebrew-versions,lantrix/homebrew-versions,mahori/homebrew-versions,Ngrd/homebrew-versions,mahori/homebrew-cask-versions,bey2lah/homebrew-versions,hugoboos/homebrew-versions,FinalDes/homebrew-versions,pkq/homebrew-versions,yurikoles/homebrew-versions,danielbayley/homebrew-versions,yurikoles/homebrew-versions,victorpopkov/homebrew-versions,rogeriopradoj/homebrew-versions,victorpopkov/homebrew-versions,bey2lah/homebrew-versions,wickedsp1d3r/homebrew-versions,lantrix/homebrew-versions,caskroom/homebrew-versions,404NetworkError/homebrew-versions,caskroom/homebrew-versions,hugoboos/homebrew-versions,FinalDes/homebrew-versions,rogeriopradoj/homebrew-versions,pkq/homebrew-versions,Ngrd/homebrew-versions