Test with WSL2 on Windows

[lptr]

Follow-up after #188.

We should test if things work with WSL2. We need CI infra to be upgraded to Windows 10 / 2004 or later first.

https://docs.microsoft.com/en-us/windows/wsl/install-win10#update-to-wsl-2

In case we can't build with WSL2, we can still run tests using -PtestVersionFromLocalRepository and setting the dependency version here to 0.22-milestone-5 or similar:

native-platform/build.gradle

Line 111 in ca1d6c8

substitute project(':') with module("net.rubygrapefruit:native-platform:${version}")

[lptr]

Windows 10 2004 is installed: https://github.com/gradle/dev-infrastructure/issues/484#issuecomment-672544348