Add dev dependencies for soon to be added unit test

+ Let one of the already affected `Cargo.lock` files pick up the
  (unrelated to this) `portable-atomic` dependency from 3639678.

Author: EliahKagan

Cargo.lock

@@ -23,3 +23,8 @@ home = "0.5.5"
 
 [dev-dependencies]
 tempfile = "3.3.0"
+
+[target.'cfg(windows)'.dev-dependencies]
+known-folders = "1.1.0"
+windows = { version = "0.58.0", features = ["Win32_System_Threading"] }
+winreg = "0.52.0"