CI builds for x86_64-pc-windows-gnu fail

[sirhcel]

Builds for the target x86_64-pc-windows-gnu is currently failing with the error message

Run cargo test --no-fail-fast --target=x86_64-pc-windows-gnu
    Finished `test` profile [unoptimized + debuginfo] target(s) in 0.08s
     Running unittests src\lib.rs (target\x86_64-pc-windows-gnu\debug\deps\serialport-0f5093a44e140359.exe)
error: test failed, to rerun pass `--lib`

Caused by:
  could not execute process `C:\a\serialport-rs\serialport-rs\target\x86_64-pc-windows-gnu\debug\deps\serialport-0f5093a44e140359.exe` (never executed)

Caused by:
  %1 is not a valid Win32 application. (os error 193)
     Running tests\config.rs (target\x86_64-pc-windows-gnu\debug\deps\config-ed1561a2e6ac87b4.exe)

like for example in job 42307951118.

[sirhcel]

Seen across all recent PRs like #259, #260, #263, #264, and #266.

[sirhcel]

Maybe #259 (comment) hints at the cause?