Support windows-sys 0.60 in arboard

[complexspaces]

This PR supersedes #200 and adds semver compatibility for windows-sys 0.60.x.

The existing GitHub action that checks the multi-version compatibility should correctly work here. We already know 0.59 works (and that release series is now deprecated), so there's no need to introduce an additional step to perform 0.59 -> 0.60 checking independently.

I had to update errno to allow cargo update -p windows-sys to reach 0.60 instead of stopping at 0.59 still. I verified this correct update behavior locally as well:

 cargo update -p windows-sys
    Updating crates.io index
     Locking 12 packages to latest compatible versions
      Adding windows-link v0.1.3
      Adding windows-sys v0.59.0
      Adding windows-sys v0.60.2
      Adding windows-targets v0.53.3
      Adding windows_aarch64_gnullvm v0.53.0
      Adding windows_aarch64_msvc v0.53.0
      Adding windows_i686_gnu v0.53.0
      Adding windows_i686_gnullvm v0.53.0
      Adding windows_i686_msvc v0.53.0
      Adding windows_x86_64_gnu v0.53.0
      Adding windows_x86_64_gnullvm v0.53.0
      Adding windows_x86_64_msvc v0.53.0

 cargo clippy --all-features
    Blocking waiting for file lock on build directory
    Checking windows_x86_64_msvc v0.53.0
    Checking windows-targets v0.53.3
    Checking windows-sys v0.60.2
    Checking arboard v3.6.0 (github\arboard)
    Finished `dev` profile [unoptimized + debuginfo] target(s) in 2.73s

[complexspaces]

The GitHub Action verifying version compatibility correctly pulled in 0.60.x into the build, not 0.59: