Update roxmltree requirement from 0.19 to 0.20

Updates the requirements on [roxmltree](https://github.com/RazrFalcon/roxmltree) to permit the latest version.
- [Changelog](https://github.com/RazrFalcon/roxmltree/blob/master/CHANGELOG.md)
- [Commits](RazrFalcon/roxmltree@v0.19.0...v0.20.0)

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

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

bindings-generator/Cargo.toml

@@ -22,7 +22,7 @@ miniserde = "0.1.16"
 proc-macro2 = "1"
 quote = "1"
 regex = { version = "1.5.5", default-features = false, features = ["std", "unicode-perl"] } # for security: https://blog.rust-lang.org/2022/03/08/cve-2022-24713.html
-roxmltree = "0.19"
+roxmltree = "0.20"
 syn = { version = "1.0.84", features = ["full", "extra-traits", "visit"] }
 unindent = "0.2.0"
 which = { optional = true, version = "5" }