Bump roxmltree from 0.20.0 to 0.21.0

Bumps [roxmltree](https://github.com/RazrFalcon/roxmltree) from 0.20.0 to 0.21.0.
- [Changelog](https://github.com/RazrFalcon/roxmltree/blob/master/CHANGELOG.md)
- [Commits](RazrFalcon/roxmltree@v0.20.0...v0.21.0)

---
updated-dependencies:
- dependency-name: roxmltree
  dependency-version: 0.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -18,7 +18,7 @@ anyhow = "1.0.100"
 chrono = "0.4.41"
 prelude-xml-parser = { version = "0.9.2", features = ["python"] }
 pyo3 = { version = "0.26.0", features = ["extension-module"] }
-roxmltree = "0.20.0"
+roxmltree = "0.21.0"
 serde = { version = "1.0.228", features = ["derive"] }
 serde-xml-rs = "0.8.1"
 thiserror = "2.0.17"