The Linux and Windows build scripts are pulling old versions of MongoDB 4.2. Modify the scripts to pull the latest version (4.2.19).

Tasks

• Upgrade MongoDB for AppImage build (0.25d) - @shreyamalviya
• Upgrade MongoDB for Windows build (0.25d) - @shreyamalviya
  • Write a script similar to the Linux script for downloading MongoDB
  • Strip everything except the mongod binary and the license file