build: use python3 for appveyor commands (#36131)
build: use python3 for appveyor commands (#36131)


gerhardberger/electron,gerhardberger/electron,electron/electron,gerhardberger/electron,electron/electron,electron/electron,gerhardberger/electron,gerhardberger/electron,gerhardberger/electron,electron/electron,electron/electron,electron/electron,gerhardberger/electron,electron/electron