Update windows-bindgen requirement from 0.55 to 0.56

Updates the requirements on [windows-bindgen](https://github.com/microsoft/windows-rs) to permit the latest version.
- [Release notes](https://github.com/microsoft/windows-rs/releases)
- [Commits](microsoft/windows-rs@0.55.0...0.56.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

dev-tools/gen-windows-sys-binding/Cargo.toml

@@ -5,5 +5,5 @@ edition = "2018"
 publish = false
 
 [dependencies]
-windows-bindgen = "0.55"
+windows-bindgen = "0.56"
 tempfile = "3"