build(deps): update windows requirement from 0.48 to 0.51

Updates the requirements on [windows](https://github.com/microsoft/windows-rs) to permit the latest version.
- [Release notes](https://github.com/microsoft/windows-rs/releases)
- [Commits](microsoft/windows-rs@windows-targets-0.48.1...0.51.1)

---
updated-dependencies:
- dependency-name: windows
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

gdk4-win32/Cargo.toml

@@ -30,7 +30,7 @@ win32 = ["windows"]
 [dependencies]
 libc = "0.2"
 khronos-egl = {version = "5.0", optional = true}
-windows = { version = "0.48", features = [
+windows = { version = "0.51", features = [
     "Win32_Foundation",
     "Win32_UI_WindowsAndMessaging",
 ], optional = true }