Replace Windows with Ubuntu in CI

Author: verhovsky

.appveyor.yml

@@ -1,14 +1,17 @@
 environment:
-  NODEJS_VERSION: "10"
+  NODEJS_VERSION: "16"
   PREBUILD_UPLOAD:
     secure: oNyyLE7/Oq3TUGZPz6DkLFPUuQzc8FiFS1iuPp7LZ2fyOP/UF4Np4NzJmWcXVyY/
 
 platform:
   - x64
   - x86
 
+image: Ubuntu
+
+stack: node 16, python 3.10
+
 install:
-  - ps: Install-Product node $env:NODEJS_VERSION $env:Platform
   - git submodule update --init --recursive
   - npm install