Fix Windows MSRV CI

[Thomasdezeeuw]

In #621 we bumped the allowed range for window-sys, but that triggered a failure in the CI (after merging): https://github.com/rust-lang/socket2/actions/runs/21984944884/job/63516686770.

$ cargo test --no-default-features
   Downloading crates ...
    Downloaded windows-link v0.2.1
    Downloaded windows-sys v0.61.2
  error: package `windows-link v0.2.1` cannot be built because it requires rustc 1.71 or newer, while the currently active rustc version is 1.70.0
  Either upgrade to rustc 1.71 or newer, or use
  cargo update -p windows-link@0.2.1 --precise ver
  where `ver` is the latest version of `windows-link` supporting rustc 1.70.0