Update to windows-sys v0.52

[skyfloogle]

This is just a cherry-pick of the corresponding commit from the master branch. Required for building on certain targets on newer versions of Rust (see microsoft/windows-rs#2774).

[Thomasdezeeuw]

Cherry-pick of commit eea9e3e.

Note to self add this to the commit when merging.

[skyfloogle]

Looks like this would require a MSRV increase to v1.56, which I understand goes against mio's policy. Does this mean building these targets on Rust v1.76+ will have to wait until v1.0 is stabilized?

[Thomasdezeeuw]

Looks like this would require a MSRV increase to v1.56, which I understand goes against mio's policy. Does this mean building these targets on Rust v1.76+ will have to wait until v1.0 is stabilized?

Yes, I'm afraid so.

[skyfloogle]

In that case, I'll close the pull request.
On the bright side, after further investigation, I found out this doesn't actually block me, as my project only uses mio as a transitive dependency which isn't actually invoked on Windows.
Apologies for the confusion, and good luck with future developments!