ci: fix appveyor's buggy Ruby
ci: fix appveyor's buggy Ruby

lexor90/node-compiler,lexor90/node-compiler,lexor90/node-compiler,lexor90/node-compiler,enclose-io/compiler,lexor90/node-compiler,lexor90/node-compiler,lexor90/node-compiler,lexor90/node-compiler,lexor90/node-compiler,lexor90/node-compiler,enclose-io/compiler